Kung Jin will attempt to search the city with others, but get separated from his group and get caught up in the riots in the process! Oops.

He'll be leading as many innocents to safety as he possibly can, until it becomes completely unsafe around the riot area. As he's combat-capable, he'll be fighting defensively to protect them whenever accosted; as his weapon is definitely supernatural-looking, though, he'll be unarmed and stuck using martial arts until he comes across a makeshift weapon. Probably a pipe or some other sort of debris he can use as a blunt weapon/staff.

Also, in spite of his earlier warnings on the network, Jin won't be killing anyone as long as he can help it: any infected will be subdued non-lethally.