She knows better than to let her guard down. If something happens to Matt, she's on her own here tonight. It would be up to her to get both herself and Matt out of there alive. She has to be ready for anything. But she still feels some level of safety so long as Matt's around. It's just something he tends to provide for her whether he realizes it or not.

It's a strange place to feel a surge of love towards Matt but that's exactly what she feels when he responds. So he'd want to hit any guy she flirted with. Does that mean he'd want to hit any guy flirting with her? It's kind of a nice feeling to know that he'd feel that jealousy so keenly and it's exactly the kind of feeling she needs to calm her nerves a little. "Maybe I'll stick to pointing an arrow at them."

Which is exactly what she does as soon as the door opens and the two men step out onto the roof.