At least She didn't pull Seamus in to the lake. That would have been worse for both of their parts. Though Seamus probably would have deserved it. And it might have served as something he could think about instead of being all broody pants as it were. It didn't bode well for him or for anybody around him really.
He moved back as she came out of the water dripping. "You're welcome." He said frowning, and patting his pockets realizing he didn't have his wand on him. That was curious. He usually had it on him and it was odd for him to be without, especially when he was out and about. Seamus was ever vigilant since the previous year.
Not having any way to help Ginny dry off (and really, would you really want Seamus's help when drying off? Likely not. He might blow one's shirt up...), Seamus quickly unzipped his heavy sweater and pulled it off. He was wearing a tee shirt and a plaid button down over top of that and he would be warm enough. "Here, here." He said quickly wrapping it around her shoulders pulling her hair up and over the material so it wasn't dripping even more down her back.
"You all right then?" He asked, surveying her, and figuring she didn't seem to be injured. Maybe just her pride.