Offside and the delayed offside

Skates, not sticks, decide offside in NFHS. An attacker is offside if both skates are entirely across the far (outer) edge of the blue line at the moment the whole puck gets over that edge; one skate touching the line keeps the attacker onside. A puck carrier is allowed to cross the line ahead of the puck. When the puck goes in ahead of an attacker by a shot, pass or deflection but a defender is able to play it, the linesperson raises an arm for delayed offside. The delay is cleared when the defenders get the puck out to the neutral zone or every attacker inside the zone has touched the blue line with a skate. If the puck ends up in the defending net while the arm is up, the goal does not count. An intentional offside brings the faceoff back to the offending team's end zone.