He needs Alex to serve as some muscle since Greg and Keith are going at it about the rightful ownership of the TARDIS. Alex manages to pull Greg out of the room so that Mark can explain to Keith how they will make him a new ear out of cartilage from his ribs. Mark then pointedly asks Jackson if he has anything to add, knowing he does not, and Jackson uses all his self-control to remain polite when he replies. Derek has been checking Keith's legs at this time and asks what he's feeling. "Hurt? Betrayed?" Keith yells. I love Keith. Derek of course wasn't worried about his feelings over the loss of a small-scale time-traveling spaceship that's bigger on the inside but rather about the fact that Keith can't actually feel anything in his legs. He orders an MRI, and then leaves to answer a page.
The page came from Ben, and when Derek arrives he finds Ben and Eli yelling at each other over how Ben's resident screwed up an epidural on their patient. The two of them are so heated I fully expect them to just whip 'em out and measure to get things over with. Derek finally gets them to tell him how the patient is doing (fine) and then orders them both to walk away.
Once he has them separated, Derek tells Ben he understands but asks him to fight with Eli about Bailey on his own time. The only problem is that they were actually only fighting just because they seem to have taken an instant dislike to each other; Ben had no idea until this moment that Eli was Bailey's current flame. Derek tries to flee but Ben won't let him and keeps asking about just what kind of relationship they have, hoping it's been just a couple of dinner dates. Derek keeps telling Ben he doesn't want to know but finally warns him not to go into a couple of the conference rooms without knocking. He was right, Ben didn't want to know. Also: have we really moved on to doing it in conference rooms? On-call rooms are one thing; at least they are meant for people to be horizontal, but conference rooms bring up a whole new level of having sex on surfaces which really should never be experiencing any threat of bodily fluids. Ben asks if Bailey has said anything about Eli and Derek deadpans that she said, "His hands have a kind of magic." Before Ben has the capacity again to form words in response, Derek warns him not to yell at his nurses -- even the male ones -- and then walks away while Ben yells at him for dropping a bomb and then fleeing the damage.