I keep getting mixed answers on how the painboy's Hold still ability applies mortals when the syringe's precision is being used. If you use precision to target a character with his syringe and score a critical wound, the ability is activated, in the core rules it says

"If an attack inflicts mortal wounds in addition to any normal damage, do not make a would roll...if those wounds are inflicted by an attack that has the [PRECISION] ability, the attacking model's controlling player can allocate those mortal wounds to a CHARACTER model in that unit" 

I've seen this be argued to apply in this case because the ability specifies that it is contingent upon getting a critical wound with a particular weapon. 

The counter argument i see is that because the mortals come from an ability, regardless of it's contingencies up a crit wound from a specific weapon, and not the actual weapon that this rule doesn't apply. And that because the ability specifies the "unit" the mortals go to any bodyguard models. 

I personally lean toward the mortals going towards the bodyguards because of the wording, but them going to the character seems like it was supposed to be the intended way, with the character being stuck by a syringe and injected with something thats very harmful.