Law 12: If a player who is on or off the field of play throws or kicks an object (other than the match ball) at an opposing player, or throws or kicks an object (including a ball) at an opposing substitute, substituted or sent-off player, team official, or a match official or the match ball, play is restarted with a direct free kick from the position where the object struck or would have struck the person or the ball. If this position is off the field of play, the free kick is taken on the nearest point on the boundary line; a penalty kick is awarded if this is within the offender’s penalty area.
Result is a caution and DFK from where the 2 balls collided.
Wild!