It did seem kind of odd that she went for the Freys instead of him. I would have thought that he'd be a relatively easy target (maybe poison?) under the circumstances. Maybe not. The Freys seem sort of bumbling so knocking them off would have been easy anytime.
At least he'll have a matched regicide record, then.EDIT: I wasn't sure--were we supposed to understand that he walked in just as this whole thing was going down in the throne room, and so he had to piece things together on his own? It seemed pretty clear that he hadn't spoken to Cersei yet.
As soon as he walked out of the frame I said "he's going to jump." Sure enough, I was right.I guess it was no surprise. We knew that he had to die to fulfill Maggy's prophecy, but I think it needed to be in a way where Cersei didn't directly cause his death.