If you focus on Canadian Penal Code 263 is: Duty to safeguard opening in ice (no mention of Hr TROLLS near the hole)
263 (1) Every one who makes or causes to be made an opening in ice that is open to or frequented by the public is under a legal duty to guard it in a manner that is adequate to prevent persons from falling in by accident and is adequate to warn them that the opening exists.
So basically if you come upon a large hole in the ice surrounded by HR TROLLS and fall in it is your own
d - - - fault. TROLLS do what TROLLS.do.