Inactivity System Fails
I complained about that event over a year ago because the NPC’s run slow enough that they cause you to lose credit. the only workaround I found was to make sure that I killed whatever spawned before they reached the camp.
There was the one where you escorted the three pact leaders for that camp. The event didn’t end until after their long conversation which could also cause you to lose credit.
It seems to be extremely variable on what it does. I’ve not had what you describe, but I have quite often been told that I won’t receive rewards due to inactivity… for an event that ended possibly over ten minutes prior. I’ve also occasionally contributed 1 kill/handin to an event and then wandered away but remained in the map, and 5-15 minutes later been awarded gold participation.
It’s also inconsistent as none of the events on the new map have the inactivity timer. You. An tag an event and then AFK to get credit when someone eventually completes it. I’ve left events several times because I got annoyed by the scaling only to get credit much later while doing something else.