What the heck just happend 0.0'

we were practicing for our intrums a 3rd year and his friend were just standing there (idk what they were doing ^^') but a teacher... guy uhhhh i fon't know slapped the 3rd year and shouted at him but at first i thought it was his dad but it's a college student (thats what the 3rd year guy said)  then my class and claver (partner for our presentation) Were asking them WTF was that they said oh its nothing then blah blah blah (so sorry to lazy to write this crap.)  we kept asking then our teacher was asking what's going on then blah blah blah.... she knows it too ^v^ cuz were partners in the dance :> but still... WHAT THE HECK JUST HAPPEND IN THERE!?!?!?!!!