Sneak

A character who can  is able to walk past people guarding a room, and is harder to hit in melee (both knife & hands attacks).

As guards are usually employed to stop, the main benefit of this skill for would be the added safety. In combination with the she should be wearing, this can make the "classic rampage opening" of killing her rather costly.

In the rare case of a or Mush Mutant using guard against your team, the other part can also be handy of course.

may be tempted to copy this as Mush, to improve his own mobility and defensive prowess (like gaining access to an otherwise guarded Bridge), however skills like or  are generally more effective for classic rampages.