Finally I have seen one, first touch after....

[mutantducky]

Does anything change on this-

So team A throws the ball in from the endline into their backcourt. Pass is caught controlled by A1 thus establishing control. Ball then is fumbled and tipped around. If a player from Team A OR Team B is the last to touch it in the backcourt and tips it into the frontcourt where it is again batted around by Team A or Team B. Ball goes into the backcourt. Team A gets control of the ball- violation?

I'm thinking yes it is a violation in either case. Even if team B touches it last(without control, loose ball) in the backcourt and again touches it again in the frontcourt, it would still be a violation if Team A gets the ball in the backcourt. So even if Team A did not touch the ball in the frontcourt they could still be called for a violation? That would be a really weird play.
If it is, do you call the violation right when Team A touches the ball in the backcourt after it had gone in the front or when they have control of the ball? Example, ball backcourt then frontcourt and then back, B1 knocks it off A1 while in the backcourt. Call it there?