Holed up in the cul de sac of the corridor junction, now with three of the exits blocked off due to damage to Black Mesa's crumbling infrastructure, Gordon knelt behind an impromptu concrete barrier, reloading his MP5 clip as quickly as he could from the box of ammunition he'd found earlier. Beside him, Barney snapped off three quick shots at the slowly approaching horde of zombies, as they moaned and cried out in voices that were almost recognizable as still human under the headcrabs engulfing their brain cases. His shots went a bit wide, blowing off the zombie's shoulder and dropping it to the floor, while the crab that had been riding it leaped free and onto the security officer's helmet.
"Ah, shit! Get this goddamn headhumper off me, Doc!" Gordon obliged, swiping it with his crowbar and sending the little extra-dimensional creature bouncing into the wall, where it died with a creaking sigh. "Ow! Thanks anyway, Doc." Barney rubbed the side of his helmet and fired again, dropping another zombie with a proper headshot this time. "That's the problem with there guys, they ain't proper walking dead. If this were a movie, they'd be risin' up because a virus or something, not from having some extra-dimensional crab bite into the top of their skull. Of course that would mean that everybody those damned aliens killed would be coming back to haunt us again." He fired again, popping a new clip in while more zombies tried to crawl over the bodies of their comrades. "Not that these guys are all that bad. They move slow enough that your only real worry is running outta bullets. That's the one thing I hate about these new zombies they got in 28 Days Later or that remake of Dawn of the Dead. Who the hell ever heard of a reanimated corpse that could run like he's Bruce Jenner or something? It ain't fair, that's what I say."
Gordon finally snapped the clip into his submachine gun and rose up over the edge of the concrete barrier. There were at least a dozen zombie crowding into the corridor, too many for he and Barney's remaining bullets to take care of. So instead he flipped the selector switch and fired a rifle grenade from the launcher clipped underneath the gun, sending it into the middle of the crowd. Zombies and headcrabs blew apart with a bang and a screech, leaving the walls of the corridor covered in blood and crab guts.
"Nice going, Doc! I'll meet up with Dr. Kliner while you try and get to the launch silo!" Barney leaped over the barricade and turned back to say, "For a guy who don't talk much, you ain't afraid to show off!"
I don't talk much, Gordon Freeman thought irritably, as Barney ran down the corridor, not waiting for an answer, because nobody ever lets me get a goddamn word in edgewise.