Oh, sorry, course, teenager. Still, a minor. Someone who should not have been on a battlefield. Well, maybe. I guess these were exceptional circumstances. Not the point.
I'm the Doctor. I'm sort of... I'm someone who tries to look out for all the universe. And some other realities, but travelling to those can be a bit harder than just through time.
You... You should know there is a Thanos here. He's not the one you fought, but he's still a Thanos and frankly I'm keeping an eye. Got to keep an eye on someone like that. Says he's changed his motives and maybe he has, everyone deserves a chance to prove they're changing. But, it might not be so nice, to just randomly see him pop up, after all you've been through. I promise, though, it won't happen here. I won't let it.