(Oh no, I'm having FAR too much fun to NOT post every day xD)
With his only exit closed off, Hugo knew that he would be in for some nasty surprises if he didn't cooperate. His eyes scanned the room quickly, attempting to find any sort of a hint that he had missed a potential exit. As he realized the futility of his search, he heard a familiar voice tell him to step away from the door. So, Rin was nearby and had a plan. It was tempting to take her up on the offer, but he couldn't endanger her by involving her in some half-cocked escape attempt. However, wouldn't he be endangering her by cooperating with her father? She needed to have her own freedom of choice, to have the ability to forge her own destiny rather than be enslaved to a man who obviously had no human feeling left.
Hugo projected a thought, hoping Rin could hear him:
I'm getting out of the way now.
The detective then walked to his left, blowing out a sigh to play up a pretended sense of apprehension about the Overseer's offer. He then spoke:
"You do have me stranded, don't you? All by myself, without any help." Hugo would continue to stall for as long as he could, silently hoping that whatever was going on outside would be put into effect quickly.