Well I don't know Rickett, he's in Hufflepuff I think, but when Antigone gets in trouble it's usually points taken for whispering in Charms or something. Oh and she's gone through three robe pets because she keeps getting them confiscated by teachers for playing with them in class, I think Lockhart lets her get away with it but she's lost one to Acton, one to Slughorn, and one to CARROW if you can believe it.

So I'll admit I'm not surprised she wasn't paying attention to who might see her when she tried hexing Rickett. She didn't quite hit him but it was a near miss I guess. Oh unless it was Rickett who almost hit Moran, I've heard it both ways. Which probably means it WAS Antigone.