The teleports he's doing are short, and individually they don't take all that much energy, but he can still feel the markings on his arms very slowly receding the more he does. This is the one power of his that's he's gotten a good handle on, and short distances were the easiest.
He tries switching up his patterns, hoping to keep her off guard. He doesn't mind that this is training technically, he's having a lot of fun with super-powered snowball fights.
He debates doing the next thing, wondering how she'll take it, but he's feeling more confident now than he was at the beginning and decides he'll take a chance.
The next flash of light doesn't appear at a distance from her, instead it appears right behind her, and very quickly Harry teleports them both directly above a large pile of snow on the roof. He's aiming to drop her onto the pile, hoping the teleporting disoriented her a bit.
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