Where to spot the ball??

[bknp7]

Last night A1 scores B1 takes the ball out of bounds and his throw in goes the length of the court, bounces 1 time, and goes out of bounds untouched by either. I know if this were to be a spot throw in we would go back to the original spot. So we are going to put the ball in play from where B1's throw in occurred, coach starts hollering it's a live ball violation and the throwing spot should be where the ball went out of bounds. I looked for a case but play that might be similar but could not find anything. He he correct? Where should the throwing in spot be?