Said stupid boyfriend is prepping Barry for a test, assisted by Lexie and Cristina. They're going to give him "a variety of different stimuli" to see his brain wave pattern. Barry has had his hand over his eyes and groans a bit when he has to take it away, reporting when asked that the pain is still at an 8. The test starts, and it's very reminiscent of what the Others were doing to Carl while holding him prisoner on Lost. Derek goes around to watch the monitors but once there, rather than actually watching what is happening with regards to the patient whose frontal lobe he might remove, he tries to talk to Cristina about the roommates. She clearly doesn't want to take part and ignores his nattering on about how he's not being unreasonable. When he asks if she would want them out, she ignores him completely. He thinks a moment, then says they have to operate (how he'd know this, given that he's not been watching any of the test, I don't know) and bribes Cristina by telling her he'll let her drill burr holes by herself. She's clearly pissed and finally spits, "Fine, I'd want them out. Whatever." And Derek manages to sound even more condescending as he replies, "You would," before walking back around to talk to Barry. Lexie approaches Cristina and stutters that she thinks she has an idea. Cristina snaps at her that she shouldn't think, she should know, and sends her off to the lab for results.