JJ still circles the area, and finishes the last of his ammo in the shotguns. He then gathers ash to refill his ammo. He then starts following the trail of smoke Cannon created, leading him to the immediate area around the bunker. He didn't see Cannon running past the bunker into the visible trenches, so he must be in the bunker. JJ then used more ash that he created to plug the entrances to the bunker, effectively caving Cannon inside unless he blows his way out.