I think I'm seeing the rules of engagement at a different scale from what I may have come across as meaning, then, and I am sorry I was unclear.
I do not think Uriel is breaking any rules of engagement, ever. I think Uriel is quite clear about being permitted equal and opposite interventions to some specific class of actions from the Fallen - I don't think that's breaking any rule, I think it is a rule. And rather a specific one, down to the level of seven words for seven words. I also think it's clear that if Uriel ever did break the rules under which it is allowed to work, it would Fall.
No need to apologize, Neuro, I took no offense. I do think on a different wavelength than most other people seem to, which is probably why the miscommunication happened.
To me, it looks as though Uriel is allowed to commit actions that it would normally not be able to if, and only if, the other side did it first. As we haven't really had a good look at what determines the actions it may take in response, I can't conclude that Uriel hasn't broken a rule of engagement in response to another broken rule. It may be that TWG allows it to "break" or "bend" the rules under very specific circumstances- but to me, doing something it otherwise would not be enabled to do, in response to a stimulus from the other side, is still a bent rule.
It also helps to clarify what Nicodemus meant when he spoke about the Church having excellent propaganda. Consider Sanya, for example- Heaven allowed him to pick up a coin, in order to make him a Knight later on down the line. They let him run around with Magog's brute strength and the knowledge of a Fallen Angel, doing no small amount of harm to the other humans/creatures running around the planet, in exchange for what he would do as a Knight of the Cross.
Heaven not being above using evil to their own ends means that the "White" part of TWG's title has a bit of a scuff on it. Do I think the Denarians are going to use the actions of their counterparts in Heaven as "proof" that they are just as corrupt, or possibly worse in nature, to justify their own actions? Absolutely. Two wrongs very rarely, if at all, equal a right. So in order to "right" the other side's "wrongs", the lies, betrayal, stealing, loss of life, bending or breaking of Will, etc... well, you get the point, I think.
Their "trusting" TWG, or it's agents, to hold to their "word" just doesn't fit with what we've heard from Nicodemus, Lash, or even with what we've seen with regards to a current Knight.