Allow me to play devil's advocate here
I'm trying to figure out what the violation is for. Is it for carrying the ball onto the court? How do you justify this call? The thrower's feet have not come inbounds.
Also, the ball has not been released for a throw-in. So how could it be a violation for being the first to touch it after the throw-in?
Is it an OOB violation? If so, based on what?