 Other safeties are unlimited, provided that the lowest numbered ball is of course struck first and either at least two object balls move in the course of the shot, or the ball-on is driven to a cushion that is not the closest to it.If a is committed (other than a foul break or cue ball foul, as detailed below), the incoming opponent may "either" take the next shot or require the opponent to do so, with all balls as they lie in either case.If the exiting opponent's foul was the cue ball into a pocket or off the table, the incoming player's shot is necessarily ball-in-hand, and "must" be taken from behind the (in ), although the incoming player may optionally require the fouling opponent to shoot again instead, with ball-in-hand behind the headstring.