HC Character died to bug

I left a map in the middle of a breach encounter with the boss VRUUN spawned. I changed my graft from one with Enervating Graft to Call the Pyre. When reentering I instantly died when my character moved.

I think one of two things happened.
1. I activated enervating graft before leaving and when rejoining I was considered an enemy of the spell, and I took its damage and instantly died (it leaves explosives on the ground.
2. VRUUN had cast his hand slam ability which all stacked up and waited for me to move before activing.

Neither of these abilities were obviously visible to me when I reentered the map.

I'm very sad that I lost my character. Please investigate and fix this bug.