Rikki could see in Ron's body language that he was uncomfortable and she immediately regretted not just asking him to lock the door instead of doing it herself. This was a mistake. Ron was going to tell everyone about the crazy new girl who could do limited magic. She was glad when she turned her back that she couldn't see his face. If she could've reversed the heat on the doorknob in that instant, she would've, and asked him to leave.
Without looking back at him, her voice low with shame, Rikki shook her head. "It wouldn't have touched you," she told him. "I was going to heat up the water molecules. They'd have evaporated around you, not popped; it just would've ceased to exist. You'd have been fine," she replied, frowning. "Depending on the size and thickness of the bubble, a few seconds? Maybe one minute? Doesn't really matter, since you got out, anyway, I suppose..." She paused and looked over her shoulder at him again. "If you have your wand, alohomora should pop the door, just...don't touch the knob," she reminded him. "It's hot." So much for being impressive.
Ron asked how she was able to do what she'd done with the water. Rikki gave a half-hearted shrug. "No idea. It's complicated," she replied vaguely. She didn't see the point in showing him the rest. Well, she supposed, two out of three wasn't bad. It was a little depressing that the wizard was the one who thought she was weird, but she supposed she couldn't win them all.
His answer about Quidditch made her knit her brows and she shrugged again, closing her fist again and watching the water boil a moment before she let it go and settle again. "I can't play, then," she replied. "Not in the rain or the snow," she added. "It was a cool idea while it lasted, though," she finished. Then, she turned finally to face him and gave him a facial shrug. "That was all. It's not much," she said, "but I still don't want people to know." She shifted her weight, then, from one foot to another uncomfortably. Rikki wished she'd never offered to help Ron. If she'd known he'd get out of the bubble on his own, she wouldn't have. She'd thought maybe she'd made a friend in him, but she was different — even to Ron — and she supposed she should've gone with her gut instinct. She was weird. All at once, she missed Cleo and Bella even more, longing to swim off to the Moon Pool so that she could steal a few minutes to be herself again. "Sort of anti-climatic, sorry," she apologized, looking down at her feet. It wouldn't have been, but now it would be, anyway...