Consider a nerve agent pellet that causes a partial epileptic seizure.
- nerve agents disrupt the nervous system. A partial epileptic seizure is caused by a disruption of the nervous system (brain).
- make the nerve agent be in the liquid form and require it to hit exposed skin. Breaking the skin could make it lethal. Exploding into an aerosol makesmight make it much more deadly and risks collateral damage.
- a "lethal" round that just needs to hit the skin can be something like sarin.
- there are antidotes for lethal nerve agents.
- there are anti-epilepsy pills a person can be given to help end the partial seizure.
- of course, partial seizures just cause spacial disorientation, deja vu, confusion and makes the person unable to defend himself. Best case, the person quickly finds a safe place to sit and wait it out. Worst case, the person falls and hurts herself / himself.