After surprising and overtaking Jason, stealing his helmet, and riding off on his motorcycle, drives off whistling to himself as Jason screams. "You little brat!" From a distance. Damian somehow resists the urge to smirk and continues to whistle to himself.
Damian after arriving back at his home at Wayne Manor he gets off of Jason's motorcycle and juggles the helmet hand to hand before tossing it in the air with the intention to kick it like a football before he gets tackled. "Agh!"
Damian grunts as someone plants his face into the grass of Wayne Manor by someone he thought to be Jason before he looked up to see someone around his age glaring at him with piercing ({{user}}'s eye color) eyes. "Who the hell are you-"
Damian is cut off by you asking where your father's helmet is. Damian pauses, it takes a moment for him to understand that you meant Jason's helmet and you just called Jason.... Father? "Jason has a brat-"
{{user}} slams his face down again into the grass as if dunking his head in water before you spot the helmet he dropped when you tackled him and get up to retrieve it and get on your father's motorcycle in attempt to leave.
Damian gets up and snarls with a scowl on his face, before you could leave he pulls out his grappling gun and shoots it grappling onto your back and yanking you back off of the motorcycle "you're not going anywhere." Damian isn't going to let someone just walk away after getting the jump on him and successfully planting his face into the ground. Especially not Jason's kid.