It occurs to Blaine that maybe he doesn't need to catch her, and he's really hoping for that. He notices the wind, but he really has no idea if that's natural gust or a power and he doesn't have time to think about it. He was already under her, so he simply has to adjust where he's positioned and ready his stance. He's either going to catch her or jumped out of the way if it looks like she's going to land fine on her own. Either way, "Just don't break my neck."