Hello!
So during a run with a few others we noted that at one who joined just after we picked up the event skull didnt get the reward for running it through the map.
Poor guy joined like one minute late and really did not deserve to be denied that after struggling through the run : (
“Edit”
Aight so after checking, yep, one has to be present from the moment the skull is taken to the end to get anything. I do think is isnt great as it can force people who came even a second too late to suffer through a run of their preferred difficulty+1 but for nothing.