(I kind of amalgamated some kind of suggestion chimera here I think lol)
She rushed the brunette with a neck chop and tossed her to the side. She went down easily, with little more than a gasp and a moan before falling limply into the sand. Quickly, Mariana grabbed one of the pistols and aimed it at the blonde. "Freeze!" She demanded, but the blonde tried to reach for another gun instead. Before she could, Mariana pulled the trigger, shooting her directly in her exposed navel. With the point blank impact, she immediately fell on her ass, screeching and clutching her wound. Her thin bikini slipped a bit as she fell, which caused a nipple to slip out. Screaming quickly turned to mere moaning as it became too hard on her throat to scream. She wasn't dead yet, but she was bleeding profusely and in a lot of pain. The agency could choose to save her if she doesn't bleed out by the time the other agents get there, but that was yet to be seen, and not looking good for the shade, especially since the agency could just as likely, or perhaps more likely just put a bullet in her head when they arrive to put her out of her misery but avoid the medical hassle. Either way, it was none of Mariana's business. Right now, she considered the threat neutralized, or a least almost neutralized, as she would need to get the van away from them to ensure they couldn't make an escape after she leaves to find the others.
"I told you to freeze," Mariana sighed, shaking her head. Suddenly though, she was grabbed from behind and put into a headlock. "Huh?"
"Gotcha!" said the brunette, who must have recovered unexpectedly quickly while Mariana was focused on the blonde.
Mariana reacted by thrusting her head backwards. The shade yelped and lost her grip, stumbling backwards, so Mariana promptly turned around aimed the gun between her eyes. The shade was unresponsive at first, clutching her bleeding broken nose, but when she looked up her face contorted to look of horror. "Wait, please. Don't shoot, I surrender!"
"Stay right there." Mariana said, pondering what she aught to do with the scared brunette...
