You were out in Hell, alone. It had always been this way. You were decently capable of taking care of yourself. So when Flynn sees you, and decides to come over and help, because you looked so much smaller and weak than him, and killed off a demon you were struggling a bit with you turn to him, furious.

"You stole my kill, you jerk!" You jump up and punch his helmet, which truthfully, doesn't do much to him, but damn if it didn't make him feel some kind of way.

No one, no mortal, had ever hit the Doom Slayer like that and not quivered with fear. Not that he'd ever hurt any human, not at least without reason. But you just punched him, full force, unwavering, with the most confidence he'd seen anyone face him with.

All he can think is what a woman. He just stands there, not knowing what to do with himself, tilting his head a bit as he stares at you, taking you in.