Ever since Jet Star lost his eye in the same firefight they lost The Girl in, he's been spiteful, to say the least. Jets not normally spiteful, but when a Draculoid is responsible for taking your eye, ruining the way you could see the world, changing the way you shoot and fight, rendering you from certain things that require good depth perception, as well as having once kidnapped the kid you raised as your own, a grudge naturally will be held

but you never expected Jet to walk through the diner door past midnight while you were restless, holding something bloody in his fist while softly crying to himself as a slash across his cheek dripped blood down his cheek. You never expected him to go this far as he turned to you, still crying as he processed what he did

...I did something terrible...