I just played a delve level. I don't know the name, but it's the one where you start on the "roof" of a building and then climb down inside. The roof and interior are completely separate pieces where you move down with a stat check, and you can't move back up.
So a master Ynfernael Hulk spawns on the roof, and we decided to leave him there because it's the first level and we only have starting weapons. Eventually an activation happens that says at the top that everyone must spend a fatigue or move away from the master.
We decided that there's really no "away" in this case since there was no way for him to get to us or vice versa, so we just ignored it. Have you run into this? How would you handle it?

It would be impossible to count spaces to the hulk, so it is impossible to move away from him. Depending on how you'd like to interpret the directions, you could

A) Ignore it.

B) Make everyone suffer a fatigue. It says, "you must do either p or q" and q is impossible. Therefore, everyone must do p.