Essex, the firearm itself, was bulky, heavy, unwieldy and unbalanced. Almost as long as a rifle (and twice as heavy) without any sort of stock or grip for extra support. The massive handgun just didn't feel right in Vier's hand, not at all. It was a bit of an effort just to lift and aim the thing. At least the side panel had snapped just as the gun was hefted up, although Vier had caught a surprised, almost gleeful look on the avatar's face before the screen was hidden away.
From the moment her finger began to exert pressure on the sensitive trigger, things began happening. Essex needed someone to pull the trigger, or to at least consent to her pulling it for them, but once the process started she was totally in control of what happened next. And, since it had a been a long day, spent teasing her with the promise of a big battle without ever actually firing her, her eagerness could almost be understood. She was a gun, she really couldn't help herself.
So, as the trigger moved, the business end of the weapon began to...open up. The top and bottom sections unfolding, deploying additional barrels and nozzles around the two that had already been visible. Then everything, and those in attendance would agree that it really did seem to be 'everything', fired seemingly at once. A massive gout of flame spouted from one barrel, as the .50 cal overpressure armor piercing round exited first. The violent discharge likely snapped Vier's unprotected, unaugmented, unupgraded Human wrist like a twig. Before the recoil could register or even begin affecting her, a grenade launched as well.
As her arm snapped backwards and her body headed for the floor, the handgun tilted upwards, a brilliant beam of light blossoming forth as the energy weapon feature blasted a furrow through the ceiling. By now Vier had fully pulled the trigger, and was most likely skidding along the floor on her backside towards the rest of the group. The flamethrower briefly discharged, before the extra bits retracted as fast as they'd appeared.
Essex bounced out of Vier's grip and tumbled across the floor, coming to a halt as the others dealt with the noise and damage of the .50 cal round and grenade hitting one of the far walls. Almost like she'd forgotten, the forward sword blade and recessed hilt blade suddenly popped out, making the weapon jump about one last time, before they retracted as well.
"...ah...that's the stuff. Was it good for you, too, luv?"