It's like this:
You attack the mob, land a hit and damage() function runs. Because the mob is mortally wounded you get the mortally wounded message.
You stab a local female citizen.
A local female citizen is mortally wounded, and will die soon, if not aided.
Tick happens. Mortally wounded characters each take TYPE_SUFFERING damage, damage() function deals their suffering damage and you get another mortally wounded message.
A local female citizen lies here immobile on the ground, suffering.
A local female citizen is mortally wounded, and will die soon, if not aided.