Edge caseWhen a defender slows down on purpose
Officials are not required to reward gamesmanship. If a defending skater could have reached the puck first but eases off to manufacture an icing whistle, many codes allow the linesman to wave play on. The rule is protecting fair races, not offering a free stoppage.
Common argument"It crossed the line, so it has to be icing"
Crossing the line is only one piece of the ruling. Officials still need the correct origin, untouched travel, and no exception from goalkeeper availability, manpower, or the race judgment under hybrid icing.