"We heard about what you did for Billy" (SPOILERS)

After Billy's hospitalized from the frat hazing incident, Hugh Grant returns to his class, and his students say, "We heard about what you did for Billy." What I can't figure out is what Hugh Grant is supposed to have done exactly. He happened upon Billy when he was being put in an ambulance, and he visited Billy in the hospital, but nothing all that noteworthy occurs that the students would have heard about. I wonder if a plot point was edited out. Anyone have any ideas?