A command that causes your character to defend against a creature they are engaged to, but not facing.
You divert some of your attention to defending against a corpse grub.
You assess your combat situation...
You (nimbly balanced) are facing a corpse grub (2) at melee range.
A corpse grub (1: somewhat off balance) is flanking you at melee range.
A corpse grub (2: off balance) is facing you at melee range.
A corpse grub (3: nimbly balanced) is behind you at melee range.
(You are also defending against a corpse grub.)