Something interesting in PT that might have major implications in BG:
When Harry is startled by Mab and Lara appearing in the car, he calls up his shield, and it's yellow-green. Lara comments on the color change, and Mab says, "He made an alliance with a powerful guardian entity. [...] It does not interfere with his duties."
So is Harry somehow drawing power from Demonreach while off the island? If so, isn't that a really major deal?
Or is this a Faerie trickery thing, where what Mab said is technically true but not actually an answer to Lara's question?