As penalties go, “did the puck go over the glass without deflecting” is one with a bright-line answer, since you already know if the puck went over the glass (it’s not on the ice anymore) and whether or not it hit something is–presumably–a matter of verifiable fact. Most of the time. Probably.
NHL GMs discuss expanding coach’s challenge through video review
The NHL’s general managers discussed the potential expansion of the coach’s challenge through video review on Monday. Don’t expect imminent change, however.
I would very tentatively support video review of other penalties with a hard–and brief–time limit, but definitely not as part of a coach’s challenge.