It might be a sign of something deeper going on, or it might be that Butcher forgot that he'd already used that line. He's said before that he forgets a lot from the series because of all the rewrites.

So maybe it's that. Or maybe Nico is infected. Or maybe he's heard the recruitment speech from nemesis himself. Or maybe the Fallen are just as evil as the Outsiders, and operate in a similar fashion.

I wouldn't be shocked if the Fallen and Nemesis have a common strategy, even if their goals might not be quite the same.. 

This can't be a coincidence, can it?

Nope, we tend to think of apocalypse as a huge bomb or disaster of some kind.  What Nic and HWWB are saying it is more of a slow rotting from with in.  Institutions are broken down little by little, loss of faith in those institutions, collapse from with in, the inability to resist outside attacks.

So I think that Eb's reaction to them is probably important.  He also seemed to know a lot about them hinting he may have dealt with them before.

It could mean that, or it could mean that in his three hundred years of life as a very powerful wizard, Eb would know a lot about them and may have fought them before. 

Butters also could be wrong about who they are, yeah he is a Holy Knight now, but has he been given a full course on the supernatural?  Michael hasn't. 

If it was Harry messing with time, it had to be another Harry, because the one telling the story doesn't seem to be.  If it was Eb, why would he risk that kind of attack upon himself and Harry by time travel?

I think we are making this more complex than need be, go back and read what HWWB tells Harry on the boat just before they get to the island. 

Mab told Harry that she and Uriel had a common enemy when Arctis Tor was attacked, and Harry believed it was Thorned Namshiel.  However Harry, who is pretty darn good with fire didn't think he could have done that kind of damage even with Hellfire, in the heart if Winter.  Has it actually been confirmed that Thorned Namshiel was the culprit?

Maybe he couldn't but then Harry isn't a fallen angel, there might be some things he just has no knowledge of.  Harry also constantly talks about older wizards who just through sheer experience and study are way more powerful than he is, well Thorny has thousands of years if not more on him.

And Harry missed the opportunity to ask that question. He probably would not get a clear answer but he was entirely justified to ask at that moment.

Yup, but he also had more pressing problems at the moment.

Sure, it's a little weird, and with time to think it probably helps Harry put the pieces together on the boat.

The point is, he knew it was off when she said it the first time out.. Just like in his conversation with Cat Sith, he pressed and Nemesis revealed itself.  He didn't press Justine in the apartment because he was already distracted by what Thomas had did,what had happened to him and his fears for Justine.

But taken over, Justine wasn't the one in control.  No mortal free will there to summon outsiders.  I'm saying she wasn't just Justine at that point, so she couldn't summon outsiders.  (Thomas got it on with Nem!Justine.  It was HWWB in the driver's seat.)

 
Do you not think that it is possible that at that point Nemesis could threaten, Justine, Thomas, and more importantly her baby?  The threat was enough for Thomas to foolishly try to murder and disrupt the Accords.. So is it not logical that that kind of threat would push the mortal Justine to call up the Cornerhounds? Yeah, it was HWWB in the driver's seat, and he pushed Justine to blow the horn.   

Nah, they aren't sneaky because they want to toy with reality.  They're sneaky because that's their only option to destroy reality.

Thank you for making my argument... You are answering your own question as to why they just don't get someone to call up a whole army. 

Raith tricked Madge into helping him.  It's not the same thing as possessing her.

No it is not, but the point is, he got a mortal to help him call up an Outsider..  Justine wasn't always the sane little thing we see today let us not forget.. Nemesis occupies her brain, but her mind still exists, no doubt they communicate, who knows what Nemesis is telling her, it could very well have tricked her into seeing Harry as come kind of threat to her and her baby, thus the mortal Justine does what needs to be done with a little umph from Nemesis to call up the Cornerhounds.

Yep, exactly.  Nemesis can't force mortals to summon outsiders, or the Outer Gates would be barely a speed bump for them.  At best, it can trick them into doing it willingly.

Which it did, I don't think Nemesis can possess someone if they are unwilling either. 

One thing to consider is that Justine/Nemesis has a wizard ally capable of summoning Outsiders....  Listen could be that person.  He's a Starborn....  Perhaps that's why he betrayed Ethniu, because he's an agent of Nemesis.  Morgan was worried that Harry, as a Starborn was an "agent of Nemesis".

You don't have to be a star born to summon an Outsider, at least I don't think you do.  Was Madge a star born? 

Nemesis wants to end reality.  After it sent Thomas to kill Etri, it was only a matter of time before Harry figured out Justine was the culprit.  Physically being rid of him for a couple hours was fine at that point.
"Does Lara know?" isn't that far out there (with the caveat that it was a Nemesis screw up in actuality).  It's understandable that Lara would come to mind for Justine as someone she worked with daily and who she knows loves Thomas as well.

Perhaps, but that was the sentence that tips Harry off that something isn't right about Justine. He says it at the apartment when she first says it and later on the boat, it was a tip off.  So while you may think it is understandable, Harry's gut reaction was that there was something not quite right about it.  Perhaps it wasn't so much what she said but how she said it.

So you're saying that Justine had an episode of insanity and was tricked by Nemesis into summoning outsiders?  Sorry, I don't buy that either.

No, her brain had already been taken over, she wasn't tricked, she'd already contrived to get pregnant by that time and proceed to push Thomas into committing murder.  Are you saying that
she was still sweet normal Justine at that point?  Because she wasn't.

Outsiders want to end reality.  They don't particularly care how it comes about.  "Not their style" isn't convincing.

Go back and read what He Who Walks Beside says, yes, they want to end reality, but they want to do it slowly from with in..  They are kind of like a cat playing with a mouse, it could end it quickly but it isn't.. It revels in the rot from with in.

they also kidnapped a bunch of low level practitioners, likely to brainwash them into service (though, perhaps to harvest resources.. or make kraken for some reason)

Yes, and lets not forget that is what Lord Raith did, he managed to recruit and brainwash Madge in order to summon Outsiders.  She was a low level practitioner.