I joined the public event in The Buried City on Mars, It spawned a Minotaur to kill, he left his room, me and another guardian laid into him, removed his head and he teleported to his 5th checkpoint and ended the event instantly. He was at roughly 1/4 of his full health and disappeared and gave us a bronze reward
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I had the same thing happen on the moon with a wizard. Don't kno why but it teleported to the end.