Damage on players.
Solution suggested by RangerOfTheOrder
"I think I figured it out
I replaced
player setDamage ((getdammage player) + damage_strig);
in the tgt_attk.sqf with
_selection = selectRandom ["body","head","hand_r","hand_l","leg_r","leg_l"];

[player, 0.2, _selection, "stab"] call ace_medical_fnc_addDamageToUnit;"