Scurry Away.

Scurry Away
In the combat phase, when you pick a friendly
SKAVEN HERO that does
not have a mount to fight, you can say that it will scurry away instead.
If you do so, that HERO can retreat.
To the skaven, prudent cowardice is a virtue, and
their leaders do not think twice about scampering to
safety when the going gets too dangerous.