In terms of weapons, Kevin had the upper hand as a katana was held firmly in his hands, but after the explosion which nearly ripped his upper body from place, stamina wasn't quite on his side. He saw his enemy charging towards him through the blurring rain and raised his blade to block the incoming strike, moving to the side and stumbled towards the wall. That knife wouldn't kill him, but if he had to regenrate much more he'd be laying on the concrete in an attempt to stay awake. The others surrounding them were in scattered positions due to the explosion and the sheer number of random individuals didn't do well in terms of dynamics. So far, this battle was between Kevin, or Viper, and 32. 

With his goggles gone, nothing stopped the rain from falling into 32's eyes. He didn't have time to blink the water away before he was upon the target. Dodgeing the silver mutant's attack, he used his left arm to slip under the target's right armpit, then brace across his back as 32 tried to force him to bend forward. 32 pressed the knife's blade against the back of the target's neck, angled slightly upwards and ready to shove between vertebrae. 
"Don't move," He warned in a growl. 

As Viper was forced into a grapple, he could clearly feel his opponent's superior strength due to Kevin's weakened state. Even in top condition, he was sure that in term of pure muscle mass, 32 had the upper hand. Either way, wether on death's door or not, Kevin had been through enough fights to become a rather stubborn individual. When bent forward, he did little to hinder 32's progress, but rather used the opening to shove the tip of his sword into his opponent's leg and tore his own arm out of its socket as to escape from the grapple. He twriled around and jumped onto the conrete and finally rolled up to his feet. "You're one hell of a guy...too bad you're physco..." With his arm healing back, he wiped his forehead and stood, raising his blade for another go. This battle wouldn't end very well, not with Viper's dwinlding strength. 

32 made a slash, but it landed in thin air. The target was fast, he had to consider that. He took a limp forward before his leg had fully healed. His gear was soaked, his was cold, he had water in his eyes, but he refused to let exhaustion grip him. He'd been on longer missions; this, he could handle. 32 took another step forward and tried again the aim for the back of the neck. He brought his right hand around in a swing that, for a few seconds, completely exposed the rest of him for attack. 32 was used to being stabbed and shot, but he tended to forget that his biggest weakness sat right in the middle of his chest. 

It seemed like both the combatans were struggling against fatigue. Their movements were growing slower and their strikes were growing weaker. Viper saw his enemy lunge forward for another strike, a straight forward attack that wouldn't have been as predicatble had 32 been at full strength, and it would have been easily dodged had Kevin not been at the edge. His mental wits weren't fast enough to see a graceful solution to the issue, but rather ran forth to meet 32 in full force. He felt how the agent's knife cut through the skin in the back of his neck, nearly cutting his spine. They had both left themselves open more times than they'd want to admit, which was also evident with Viper's sword slashing his enemy across the chest before he stumbled behind him and spun to face him again. Their wounds were gone just as fast as they appeared, but the lack of energy and the heavy rain made it hard for them to aim for the weak spots.

32 pulled back as the sword ran across his chest. The sound of metal meeting metal could be heard through the downpour. The front of 32's uniform was slashed clean open, and while the cut in his flesh quickly healed, the scratch of the outer metal of his heart didn't. The blueish-white light glowed through the heavy rain. 32 huffed and made another attempt. One had to give the guy credit: he didn't give up. 32 lunged at the target once more, he stepped towards the side and once against tried to jam his blade into the target's weak spot.

The glowing heart was dimly visible through the rain, quickly stealing Viper's attention. So that was it, that was his 'brainstem'. A single thought immidiatly came to mind; electricity. The two would continue their brawl for a few more moments, wounds going both ways. Kevin was feeling his vision getting more and more blurry which was the big red light to end this fast or else he'd meet many complications. Through the fight Viper noticed a puddle with an electric wire dangerously sparking through. That was it. With the incoming strike, Kevin dropped his sword and sidestepped 32's blade and grabbed his arm before wrestling them down towards the puddle, sending electric shocks through the both. With his last sliver of strength, he managed to roll out of the currents and found himself on the wet concrete, his vision fading. If that didn't stop his enemy, Kevin was out for the count. 

32 struggled against the target, who was shoving him down to the ground. He'd been taught never to let the enemy pin you, which he assumed was what the target was trying to do. The moment he hit the ground, his body went numb. 32 cried out as electricity sputtered and shook his body, his heart's light flicking and even giving off a couple sparks. And then it went out. 32 went limp, silent. It appeared that the shock had short cirqued the heart, possibly even killing him. He didn't seem to have a pulse; his chest didn't rise and fall with breath. But no one really had time to stick around and find out; the cops were coming.

Sirens wailed nearby. A cop car pulled up at one end of the ally, soon to be swarmed.