backcourt violation?

[cdoug]

I was watching a playoff game last night and wondered about a call. I assume that they were right since the official making the call has probably done more tournament games than I've done "regular" games, but wanted to ask.

Sit: team A is inbounding the ball in their FC but close to the division line. A1 passes the ball in, A2 jumps, catches it (while in the air) and lands in the BC. A2 took off from the FC. The official called a BC violation.

My first thought was that it's not a BC violation because you can go into the BC for a throwin, but then thought that it might fall into the you are where you were until you get where you're going philosophy. Help me understand, please.