Not sure what location you were on for these Public Events, but if you happened to be on the Tangled Shore, keep in mind that Spider's wanted bounties sometimes mean those players are going for the boss kill for their bounty rather than the cryo-freeze. Not every time are people just doing it to intentionally screw you over. Most of them probably don't care enough about you to do that. Lol
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There definitely people who DO kill bosses intentionally and laugh about it when it pisses people off. Happened to me just yesterday.