Your boot slams into his chest, meeting steel plating, causing the tech priest to stumble back, chuckling, brandishing a drill hand, and obscuring the shot of the two navvies beyond the narrow door. From the noise of it, the dermal plates were a slap job on his part. The navvies cry out, as the tech thinks that a drill is an effective weapon.
You duck under, grasp the arm firmly at the wrist, then reach with your bionic arm. He struggles, has some enhancements, a tough one, the drill is spinning sputtering and kicking- ah.
You feel the top of the dermal plate, and will your bionic to grip as hard as it can, and pull. The Adeptus Mechanicus shrieks. While the steel might be strong, the flesh surrounding it is weaker. The collar bone pops out before the left navvy, the bearded and jumpier looking one decides to just shoot through the tech priest.
A few get sputter through the plate, embed themselves in your syn skin. The rest finish the job you started on the tech priest. The right navvy comes through, gun first as the tech priest starts to crumple. The drill arm is still going as you toss it at him.
Hot blood spatters across your cheek as you roll into the hall, drawing inaccurate fire from the bearded navvy. He spares a second to see the red road of ruin running down his comrade's body left by the tech priest's drill before you're on him.
He fires again, and you feel hot gunpowder kiss your cheek. One hand has to grab the knife he attempts to draw, the other the gun he holds. You bring your forehead into his nose, hard.
Three times his breaking nose echoes in the hall, and he falters each time. First to his knees, then he is only held up by your strength alone, then before he can plea for mercy, you push the nose the last few inches into his brain.