Sorry, in Kingdom Hearts he's really attached, big brother bear style, to Aerith...?

[Leon's eyes grow wide when he hears Aerith's voice- She is a sister to him in his world and even if the woman may be from that other Tifa's dimension she- shouldn't be there. He slalms the door open, walking outside]

A- [He manages to interrupt himself in time, no need to scare her if she doesn't recognize him. And if it's his Aerith she'll definitely call him by name, probably laugh a bit because he's letting his beard grow and they'll discuss about how glad both are because Yuffie is still safe- or something like that. And if she's not his Aerith there's no need to freak her out as a big, muscular leather and belts covered guy who misteriously happens to know her. ]
Come inside, the building is about to lock us outside!

[He raises an eyebrow when she speaks to someone else, in the dark he can see no one but Leon has his priorities set: the house seems safe, no monsters or strange noises as far as he knows, and Aerith can't stay in the snow.]

You go inside, if there are other people here I will wait for them.
[The man instintively placed a hand on her shoulder, trying to push her behind. He may be harsh but he's not going to let her freeze in the snow.]