Huh. Must’ve been bugged then on its first hours, just like the set was, or simply my PC not keeping up at the time. My bad guys!
Beyond that, I can only guess it was the explosive blight (green explosion sfx and nothing else thanks Blizzard very cool), or something to that effect. It would’ve been nicer if we got a two-sider of a questline instead of just guessing why the hell they’d do that and have it leave no trace.