Nick doesn't regret taking a quick, cheap shot like that. She's definitely someone with her wits about her, even if it didn't save her in the end. His eyes are fixed, waiting for her to fall with shock or pain or whatever. To his annoyance, he isn't that fucking lucky.

She moves, and she moves fast. His hands fumble to raise the rifle again and it clicks to signal the fact that he's out of bullets. He swings the gun wildly, hoping to smack her face before she does any damage. His chest is exposed and the knife slashes over him. The layers of clothing dull the strike some, but it hurts like a bitch and he hisses under his breath.

A sharp kick is aimed at her legs, wanting to knock her to the ground before she does that again.