Lemme guess. Conducting weapons and HK models tests in real-life scenarios?
Bingo.
The model continues causing havoc, and as the citys guards are deployed with helicopters, tanks, and infantry and the sort, it lowers its rifle, taking its left hand off the foregrip. Once the helicopters and tanks begin firing upon it, it doesn't react and allows the missiles and shell to strike it with seemingly pained shrieks. It staggers back, a bit of metallic armor falling off to reveal muscle, that seems to be moving very slowly, like that of a snake. As the second volley is fired, the model lifts its left hand, and from its palm, where the supposed thruster is, a field it deployed out in front of itself, catching the missiles and shells and slowly turning them around. Its eyes begin to flicker once or twice before it lets out a roar, thrusting his arm forward as it sends the shells back the way in which they came before shouldering his rifle again and continuing to go about its rampage, appearing to be panting as it does so.