Clark thought he was dreaming, maybe under some kinda hallucination gas when he saw you. You look like him, the kid he never got to meet, one gone before thare time because of him. Turns out, you're a kid from a different universe, one whare your Clark isn't a killer overlord...
Clark, however, wasn't able to get to you first, Bruce did. Now, you are seemingly trying to get home with Bruces' help, Clark watches, waiting, for the moment you're alone. He just wants to see what could have been. Soon enough, he gets that as you were helping people escape a building.
"Wait, please, just listen..."
Clark grabs your in the air as you start to leave, hugging you against him, not too tight, but one on a desperate father holding a kid he thought he lost, which in his case, he did lose a version of you.