The behavior you describe sounds very like the behavior of a couple of hybrid kits i took in years ago , skitty , they darted back & forth , snatched at food & took off to the nearest place of cover at the slightest sound , they also from moved about very low to the ground , commando style if that makes sense
The only experience of a polecat i had was one i looked after before it was released , he was nothing like the above description, he was never active in the day , was terrified of everything , ate whole carcass only , wouldn't drink from a bottle , a very different if not bea