The first thing Trevor did upon arriving into an obvious trap was change into a German Shepard. The second thing he did was wonder what precisely he had gotten himself into. He didn't give himself time to ponder that. He needed to get through this and fast, he thought as he heard something move toward him. His head jerked in that direction then forward as he heard a wall shift in the distance. Trevor opened his mouth, his head high as he listened and scented for anything nearby. There was nothing, nothing human at least. Nothing living that he could detect, nothing that warranted extreme caution yet.
And yet, even if there was, there were few risks Trevor wouldn't take these days. Going down to an underground world full of humans and humanoids who hated him would normally have warranted much more caution than a quick reading of the information Teague had gathered prior to his disappearance underground to glean the most important points and the hasty grab and toss of the vial of "shadow powder" in a move he was sure neither Cora nor Delilah had anticipated or they would have kept the powder out of sight and out of reach.
Still, Trevor knew he had to keep his wits about him and smell, listen, and tread lightly. He needed to be able to hide and change back quickly so he could gain an upper hand--not be caught and forced back to his human form. The pain and the confusion would be enough to grant his attackers the advantage, and Trevor was not for that. He needed to find Teague and get his girls and leave. He had Cora coming in soon as back-up, he was sure, but that didn't mean he could simply throw it all to hell and fly by the seat of his pants.
So, Trevor went as slow and steady as the moving walls allowed, ever watchful, and ever aware.