When the TARDIS starts influencing his surroundings, Gabriel focuses intensely on her. For now, she's not doing anything dangerous, but he doesn't trust that not to change at any moment. Her cautious approach amounts to nothing as he steps into her personal space and lifts a hand to encircle her neck. His intention isn't to hurt her, just to be threatening enough that she knows he's not going to put up with anything but the truth.

"What are you?" He casts a glance up the marble steps. He has to go up there soon. If this takes too long, he'll have to leave her behind. "Why would I need your help?"