Controlling one's strength

Out of all the travellers, only a few of them were able to comprehend what had happened, or at least saw what had happened because to most, all they could see was a red masked vampire with his hand out—pointing at the location where one of them had fallen from a rooftop.

Quinn stood somewhat behind Hannah, who was leading the vampire group and standing at the front. She hadn't expected him to make the first move, and she didn't see the blood bullet leave from Quinn's hand. All she could see was the damage that had occurred on the Travelers leg. Allowing her to guess what the attack was. Looking over at his hand's position had only confirmed her thoughts.

'That has to be the blood bullet. Can he perform something like that?' but he smells like a regular vampire; how is that possible? And I've barely seen a bullet that fast before.' Hannah thought.