Thrower established inbounds?

[jeref]

Okay, I'm to tired to get my books & I think I may have blew this one. Had this happen tonight---A1 is on a spot throw in under the basket in her FC; the pass is blocked & deflected inbounds by B2; A1 enters the court and has one foot inbounds & the other foot in the air (from out of bounds) when she touches the ball. I called a violation on A1 for not having both feet established. Does a player have to have both feet established or just one? Thanks...