Really bad. [Vash pushes himself off the bed just enough to turn and look into his brother's face. It hurt and he winces at the action, but he felt this was important.] That place will take the choice away from you Knives. It will make you want things you might usually never want.

[He hesitates. Trying to think of the worst possible thing that could happen in Knives's opinion.] That place could make it so you want a human to humiliate you before you want a human to have sex with you. Is that something you want to possibly be forced on you? For them to mess with your mind to think you want it until you get it?

[It mentioned in that file Knives was given that Vash had been sent to the center. Most of it detailed the officers injured trying to bring the Plant in as the police weren't given the information on what the LIES staff did once they had him.]