To elaborate, their special attack. To put it in perspective, why exactly is a zombie, in possesion of malfunctioning bionics, able to accurately and reliably able to bolt the main character and only the main character? Even with the possibility of slight intelligence, it just seems unreasonable, given how much should be stopping them. This is contrast to the bio operator’s bionics, which are actually sort of working like they should, and have a reason why they would work on the PC (bodily context commands, for instance). Bio operators are fine.
If i may make a suggested change, perhaps replace the shocker’s special attack with a constant effect, where small amounts of sparks would emit into the nearby environment (1-4 square range), agitating when the shocker is struck, or when it passes by metallic terrain or objects? This would better reflect the condition of as well as the extent of the zombie’s ability to utilise it’s bionics, i believe.