The plan would've worked, or, probably, Dean knew. By this time they'd arrived just at the outskirts of the city, and if they could progress any further, though it was dangerous in many of the houses with unforeseen dangers, he was sure they could've lost the monstrosity that was once Sean in any of the buildings. The one hitch however that they encountered was the massive hand that came swooping down through the air, collecting Kyna and throwing her off to the side, her limp figure coming down hard on the asphalt several meters away. Immediately Dean had altered courses to try to assist the woman, but the heavy, now-armored foot of Sean's had come crashing down before him, causing the earth to shake and split and sending the man stumbling back.
Perhaps it wasn't worth it, the hit was powerful and the way she was sent soaring away would've killed most people, but then again he had to check for the watch of Alyssa's. He knew she'd picked it up prior, and currently he was cursing over it.
"Derek!" he shouted, "Cover me!"
Without even thinking further, Dean knew waiting would probably stop him from doing what he was about to do. He was going to die anyway, but currently he needed that watch which was currently in Kyna's possession, and, as he hadn't seen her drop it, he knew he'd need to acquire it before Sean fulfilled his screams of hunger. He didn't waste any time in firing, but instead simply bolted forward. Sean's steps were large and could cover a fair amount of distance, but Dean was quick and he was certain that his running pace could outdo the beast as he dashed in between his legs, staying as low and wary as he possibly could to avoid being clobbered and thrown away like a rag-doll, like Kyna.
As he approached the idle figure, he ignored any and all screams of protests from the behemoth behind him, but then he had to decide exactly what to do next. Leave the girl, take the device, or try getting them both? Her state, he had to admit wasn't the prettiest, and being able to see through her skin made things all the worse, but nonetheless, while she was still capable of producing coherent thoughts, and he only assumed she was, and while he could see just the tiniest amount of light, though fading in her eyes as she drifted into a state of unconsciousness, or death, she might be of use. Either way, Dean had all this sorted out within a second, though made sure to detach himself so he could truly promise that if worse came to worse, he'd spare everyone and a bullet, if only for the sake of humanity.
Picking up the girl, he didn't have time to dig through her person to collect the watch anyway, so instead he simply made a beeline for the nearest house. Although she wasn't at all heavy, he was still slowed, but not enough yet to be caught by Sean whom he knew was probably still in pursuit. Derek, hopefully, he thought, could figure out to just run by now, and he could loop around once things settled, but until such times, Dean's only thoughts were to get to the relative safety of one of the buildings. Once there, the maze of halls and doors and back exits would provide adequate coverage for an escape deeper into the city, and hopefully closer to wherever Alyssa had been taken.