"No!" It was the first thing to go through Priestly's head when he saw that gun move to her head, and it was also the first thing out of his mouth. He had only just started moving quickly towards her when the trigger was pulled, and he panicked. "No, no, no," he muttered, wrapping his arms around her, catching her as she fell, then lowered himself to the ground with her.
He knew that she could heal. He'd seen it first hand, hell, he'd even experienced when she saved his life, but watching his girlfriend shoot herself in the head was a bit too hardcore for him to have instantly thought about the healing. Eyes welling up, Priestly tightened his arms around her, hugging Claire tightly to his chest. It wasn't until then that he thought of the healing.
"Come on, baby," he muttered, rocking back and forth a bit as he continued to hold onto his girlfriend. "You've got to heal for me."
He wasn't sure that even she could survive getting shot in the head though.