The answer to 'what happens if' in ice hockey is 'play goes on' more than in any other I'm aware of, I think it's great.

'Substitutions' being on the fly too (and <1m apart), there's just something kind of raw and basic about it. Obviously there's loads of rules, but the general gist/feel of it just seems a lot more.. I don't know, 'informal', or something, than other games.