Saw this happen at seers bank today. You guys probably know that if skull timer resets, they can still attack you in safe zone.
But these dues were deliberately luring people to attack them as their skull timers were about to reset. Then they were able to barrage/range the lower level dudes in the bank, unskulled. This happened twice in 1 minute of each other.
Moral of the story: Don't attack skulled dudes near safe zones, unless you are better, and better prepared than them.