At a professional contest you shouldn't be allowed to continue if you get clearly knocked out. The risk of a 2nd concussion and serious damage after is way too high. With no skaters with medical coverage after, or some sort of union monitoring them, its scary as hell given what we've seen in the NFL and NHL. I'd add, if I was a contest sponsor I wouldn't allow it, just due to the potential liability. Now, if you are in a private contractor situation where you knock yourself out, then try again at a spot, that is on you.