He starts to sprint back towards the building, "Do you know how to turn on the turrets by any chance?"

"Nope"

"Damn it..." He hits the button on his belt twice, causing the building to open slightly, then close again. He jumps through the small gap at the bottom of the door, and runs to the desk in the living room. "Do you see it?" He presses a seemingly random sequence of buttons.

She was confused

"Exactly" He flips on the thermal filter, revealing a giant mutated monster. The turrets rev to life and begin to open fire. "It's invisible."