There wasn't much use in struggling. He was having trouble breathing and the vampire's grip was strong. He could attempt to kick at him but that wouldn't do much. He could try and pry his hand away but that probably wouldn't work either since it was tight like a vice.
He maneuvered one hand behind his back, reaching for the phaser. He really only had one shot at this, and that was only if it actually worked on vampires. He hadn't had an opportunity to test that theory out yet. He got a grip on the handle and pulled it from it's position tucked in his jeans, then quickly aimed it as best he could in front of him as he started to black out and pulled the trigger.