Guild Wars 2

How I did this unintentionally:

a) do it legit way, kill boss
b) go back to fort, launch the cinematic
c) ignore marjory&kas dialogue, climb on the wall and jump down
d) go to the 4 alive seraph and 1 dead seraph, ress him (this is why i did all this, i saw dead npc icon on minimap and i wanted to see whats going on)
e) proceed through the fort, go to iron cart.
f) realize the boss just restarted o.O you can kill him again without npcs, the mechanics will stay (except kasmeer spells)

- it was in repeat mode
- first kill was done with protecting all marjory minions succesfully
- engineer sylvari female if it makes any difference for the bug-reproduction
- at the beginning i protected all 4 seraph from dying for fun, i have already done this achievement.

I tried to reproduce it again in the same instance after second kill – the seraph were there again, one dead ressable, but it didn’t reset the boss, its corpse stayed where i killed it.

Also, after second kill, dog finished off a walking bone minion and didn’t disappear, instead it rushed and attacked the plant-bone wall behind it and kept hitting it.
I would also like to point out that the mordrem dogs are obviously bugged. Their movement speed is about 400% or something, this is so immersion breaking.