The NHL has changed the rules regarding injured goaltenders and their replacement.
In 1982, Al Arbour and the New York Islanders were about to be sent home by the Pittsburgh Penguins in the first round of the playoffs.
Down 3-1 with under six minutes to play, Arbour elected to pull Billy Smith, replacing him with Roland Melanson.
A newer rule at the time allowed for the replacement goalie to get a two-minute warmup, so while Melanson got warm, the Islanders got a breather.
Arbour and the Islanders tied the game in dynasty fashion before John Tonelli scored in overtime.
[embed]https://www.youtube.com/watch?v=Xbg8f1w_KZU[/embed]
The goalie change by Arbour is a small detail of what allowed the Islanders to eventually go on to win their third straight Stanley Cup, becoming the first team to win four straight in 1983, a year later.
The NHL didn't love what Arbour did, essentially using a goalie change as an extra timeout to give his guys a breather.
Eventually, the NHL disallowed replacement goalies from getting a warmup before leaving it up to the discretion of referees in 1988, which was later changed to no warmup at all.
Now, ahead of the 2024-25 season, the NHL has amended the "Al Arbour goalie" rule.
If a goaltender gets hurt and has to leave the game due to an injury that requires mandatory medical evaluations, the replacement goalie will get a brief warmup.
Here's that rule and others: