Notorious cowards, Skaven leaders often prefer to lead from the back.
A character with this special rule that has joined a unit that has a Unit Strength of 10 or more may voluntarily ‘retire’ to the rear of the unit at any time, moving through the ranks and taking up a position away from the combat. Should they do so, they are no longer within the fighting rank and cannot make any attacks or have attacks directed against them. However, the unit may still use this character’s Leadership.