The people behind the computer monitors are not the ones making the threats. Team Canada officials have already talked to the IIHF to tell them that there will probably be an incident if Ovechkin comes onto Canada's side of the rink during the warm-up. That's not coming from us computer nerds, that's coming from Team Canada. We are not threatening Ovechkin, we are trying to inform you that there is the potential for a confrontation.
Team Canada players will not let Ovechkin skate through their zone and pretend to score on their goalie before the game. You might see it as harmless fun; Team Canada players will see it as showboating, and an attempt to intimidate or psych out the goalie. I doubt they would attempt to cheap-shot him, but they would certainly grab him or tackle him to stop him from doing it. He would be surrounded by Canadian players yelling at him and shoving him; Russian players would come to help him, and you get a scrum that could easily turn into a brawl.
I don't really want to see both teams disqualified and the bronze medal game turned into the gold medal game. I would prefer to see a hockey game. So I think IIHF officials, having been informed of the potential for trouble, should ensure that Ovechkin follows rules of conduct during the warm-up.