The vampiress had lunged with such speed and ferocity that it was too fast for him to react. She grabbed hold of him and the two tumbled across the roof until she had him pinned. He had lost hold of the bag as they rolled, some of the contents spilling onto the roof. Visible was a long metal spike, a metal bat still half-concealed by the bag, and an aerosol can.
A set of fangs pricked his shoulder. It would have been more painful if he weren't already full of adrenaline. Gray moved his left hand quickly to draw the syringe from its place in his front pocket while drawing a Glock with his right, the same arm she was now drinking his lifeblood from. She in her fury smacked the syringe from his hand, pinned his arm and continued to draw from him. It clattered to the side. With his handgun he started to unload the magazine into her abdomen while using the painful opportunity to shove her off of him. Her teeth tore a chunk from his shoulder. She definitely looked more the monster now. He rolled to side to the closest equipment - the bag. What he grabbed was the metal spike. Sure, special wood could kill a vampire. He didn't want to kill her though. He wanted to paralyze her and if the syringe wouldn't work then filling her heart with some cold metal would. If this didn't work he may have to behead her and abandon the information before she leeched more of his life away.