This has been happening for months and im highly disappointed that it's still happening because it's a huge waste of time. There's a glitch where you defeat sekrion and you don't even get the stupid bounty.
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I have a couple of theories. It's happened when I've been busy killing adds, so I'm thinking it's either that you have to his sekrion in the last 30 seconds of his life OR you have to see him killed. I'm not sure which one.