Offside Pat. If you kick the ball forward and a player is ahead of you (common for backs when defending) it’s illegal (rugby has laws, not rules) for the players ahead of you to chase the kick. The kicker as he runs beyond them plays them back onside. You’ll sometimes see a player stand in the arms aloft ‘not me guv’ position attempting to show he’s not interfering with play while waiting to be played back onside