I'd have to check with my dentist, on your first question.
The style and rules of the game has changed over time, right? Face macks, blue & red lines, size of rinks, Goal size, overtime, shootouts, speed, size of the players...etc. Should I go on?
My thought of what you said here:
Is that, you cant assume. That's why I was asking for someone who may have seen the game. Also, assuming that just because they are on the ice at the same time, doesn't mean they're going to go at it, just because. Please understand, I know what you're saying. But I don't think its entirely correct. Nor am I possibly.
But I doubt it.