(vy)střídat během hry (v momentě, kdy hra nebyla přerušena a pokračuje)
Because players are often substituted while the puck is in play, players frequently change on the fly, jumping over the boards and onto the ice to replace teammates. Google
Because the flow of the game is so rapid, players skate 90-second to two-minute shifts and change on the fly. Google
Hockey has the unique rule of allowing players to "change on the fly." Google