I don't think it's anything with his grip, but with his velocity he can drive it better obviously.
But snow doesn't actually make it slick. It takes quite a bit of moisture to get the ball slippery, snow is just enough that it actually can make it a little sticky feeling. I know I know dumbass but when I was in HS I played QB and I always liked the ball just a little damp. It makes it feel tacky.
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