What the hell, indeed!
Seems like the only notable constant is that the GoD set is used- this 144 isn’t using either of the big move speed buffs utilized in the 146.
The results seem way too extreme to be an effect of “accidentally kept Ethereals”, as Shu has pointed out. No DH was ploughing 144 like this last season, especially at 2k paragon.
It’s too extreme, too, for “accidentally removed pierce cap on NCC”. GoD was more powerful in those days, but not 144 in 3 minutes with 2k paragon.
And, I sort of wondered if maybe the effect of Momentum had been accidentally inverted… normally, each stack of Momentum gives you 8% move speed. So, maybe each 8% additional move speed was reading as a stack of Momentum. But, I think that would be immediately noticable to anybody looking for the bug. And, even with about 400% bonus move speed, this would only about quintuple your normal damage, which I think is probably not enough to explain 144 in 3 minutes. And, if it were that, why wouldn’t we see the 144 guy with move speed buffs, or the 146 guy with even more move speed buffs, like SP: Shadow Glide, or use Lianna’s Wings, etc?
I also wondered if it was something like a bug where, if you reach the exit shrine at the end of 7, 8, 9 floors or whatever, and use it, the rift gets marked as cleared. That would kind of explain why GoD is used- because it’s fast. But, if you could do that, why wouldn’t you just do 150? So, it’s probably not that.
Whatever it is, it lets you either kill or skip both the mobs and the boss… and it only seems to work with GoD.