Hockey is an interesting situation. It's cold on the ice and much warmer above. The air isn't going to circulate like in a normal arena. That cold air near the ice is going to stay trapped beneath the warmer air above.
Ouch. Frankly I’m shocked how little covid has been an issue for the NFL in the recent weeks. The NHL which has literally 2 unvaccinated players has been having huge issues with it. 10 days quarantine at least even with zero symptoms. I really do wonder if teams are fudging covid protocols.