Logan was sort of waiting for more of the story before he realized he was supposed to draw the logical conclusion. "So you think he's your father? In the future?" Well, it would have to be in the future, wouldn't it? It wasn't like he was her father now if she was from the future.
If she was fishing for advice, she was probably going to be out of luck. He'd just tell her to ask him about it if she was concerned, so he shrugged a little. "Sure he'd be proud to know he had a kid like you," he said. It seemed like the thing to say, even though he didn't actually know which of the teachers she meant.
Still, she seemed like a decent person. A little energetic for him, but a good kid.