Ple-Sen
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I'm saying that if the leader buff is going to disappear anyway, then maybe it makes sense to leave the party in advance and take his wyvern off him, so he can't fly around and cause trouble either.
Hard to say. In your current form, you don't look like a priority target for him. So there's a chance he'll leave you alone and fly with the wyvern to our corner, giving you a chance to survive.