Cuts through bridge

I heard the Sword of Faith come alight in his hands, and a glance over my shoulder showed him hacking through the bridge at his feet as if it had been made of so many soap bubbles.
I spun back to the enemy, brought my shield up—and stood tall.
“You!” I said, relishing the moment. “Shall not! Pass!”
They replied with a hail of automatic weapons fire. The impacts against my shield all but blinded me.
And a freaking Fomor sorcerer popped out from behind a veil that had concealed him from me and lobbed a viscous-looking ball of quasi-liquid at me.
I’d been burned once before, hah hah, by assuming my shield would be ready to stop whatever came at me. I ducked and skittered forward and to one side, and the blob hit the bridge where I’d been standing.
Whatever that stuff was, the xenomorphs’ blood had nothing on it. It started chewing at the concrete and the steel itself, bubbling and hissing as those substances were dissolved, and a hideous stench filled the air.
The Fomor smiled his froggy smile at me and tossed another, to my other side. I dodged again, but I had less space to do it in—I did not want to walk in one of those puddles. Whatever that vitriol was, it would probably devour my feet in seconds.
And then one of the turtlenecks lobbed a grenade high, aiming for it to come down behind my shield.
A flicker of will and a muttered word, and I batted the grenade out of the air and back down among the turtlenecks.
There was a fine amount of screaming and confusion as it went off, and I checked over my shoulder.
Butters had hacked through the bridge, but the thing hadn’t fallen yet. He dashed twenty feet back and started chopping again, to drop that entire length out of the bridge.
I held my shield and my ground as the turtlenecks recovered, way too swiftly to be acceptable, and poured it on again. The Fomor sorcerer had vanished. Those creeps didn’t like to expose themselves to danger when they could whip their minions forward into it instead.
“Harry!” Butters shouted.
I started backpedaling, my shield bracelet beginning to overheat from use now, dribbling green-gold sparks everywhere.
I made it back to Butters and he slashed down with Fidelacchius one final time, before both of us rushed back, around the curve of the bridge, and out of line of sight with the turtlenecks. There was an enormous groaning sound, then a rumbling crash and a scream of ripping concrete and twisting metal.

Battle Ground Chapter 25, Page 229-230