"Whoa, whoa, hey!" Topher jumps forward a little at the guy suddenly deciding to carve his hand open (with something that is so not sanitary, not that the physical effects really matter, but the fact that he would do it does), but he stops short of grabbing the plate or the guy. Given his reaction and the dreamspace getting definitely more uncomfortable in barely perceptible ways, Topher doesn't really want to crowd him.

"Um. Would you like me to prove it?" he offers, since he guesses that was the purpose of what the guy was trying to do. And, well, that's hardly difficult. Or, either it's a dream, or Topher has ridiculous illusionary powers. Which he sadly doesn't.