Not sure it is an actual bug.
Probably because you had gone to far in to do the observations.
Some events in Act 1 only require proximity to trigger/play out.
Example: The dying True Soul Dwarf and his two little minions will trigger if you go into view of them, and say, then back out and go somewhere else, long rest, etc.
Test it by going into view of the True Soul Dwarf and his two minions and then back out. In a short amount of time, you will actually see the two minions run off and the True Soul Dwarf dies.
I am thinking that this is what occurred with you and your observations and Halsin. He triggered and his role played out.
Last edited by bullse; 09/01/21 03:31 PM.