(Warning: small spoilers)
In the personal story “Brute Force” (human, first selection to fight with whom, in this case Vigil):
I had to kill some attacking waves. At the third(?) one, when the group of plague carriers arrived and exploded, I got downed, some Vigils needed to be rezzed. And then nothing happened any more. I’m standing with my Vigils for 10 minutes browsing the forums, but that’s it.
After everyone was rezzed and I started looking around what would happen next, suddenly one Risen (an Asura) spawned between us and died with some loot for me. Nothing happened afterwards.
I didn’t fight any Risen on my way from the start of the instance to the hub with the children and Vigil.