NHL issues memo after Ottawa Senators and New Jersey Devils skaters ignore Rule 9.6

The NHL has reinforced its mandatory helmet rule for pre-game warmups following recent violations by Ottawa, San Jose, and New Jersey. Deputy Commissioner Bill Daly clarified that players entering the league from the 2019-20 season onwards must wear helmets, addressing a trend of teams foregoing them for motivation. No penalties are expected, but the league is emphasizing player safety.