He may not be pressing her on the Coach but as soon as this conversation is over he intends on looking into her story.

He studies her as he answers, "Yes." still not loosening his muscles.

"Why are you still here?" he asks, still suspicious. If she is looking for a different professor and isn't interesting in anthropology he doesn't understand why she is still standing in his door. He would walk away and ignore her but she is a concern he can't ignore.