Multiple players out of bounds - tell them?

[bucky]

Team A scores a basket and Coach B calls a timeout. Out of the timeout, Team B has all 5 players out of bounds, which is legal, along the endline for the throw-in. Team B successfully completes the throw-in, moves up court, and scores. Team A inbounds the ball, moves up court, and commits a violation near the endline, awarding the ball to Team B for a designated spot throw-in. Coach B calls a timeout. Out of the timeout, Players B1-B5 come on the court and head towards the endline for the throw-in. B1, B2, and B3 go to spots out of bounds, which is illegal, along the endline.

How would you handle this? Would you begin telling the B players that this is not allowed? Would you put the ball at the disposal of B1 and then call an immediate Technical foul? Would you call some type of violation after giving the ball to B1 for the throw-in? Would you do nothing and allow the throw-in to continue? Other?