Snowballs can easily cause injury. Snow can be fairly icy, and getting hit by a snowball like that in the face will likely produce a lot of cuts, and if the ball is frozen solid, it can actually knock someone out.
It's usually mindless fun, but I've seen many snowball fights involve balls of ice, and snowballs mixed with rock from where they grabbed the snow. Now to mention the possible damage of property. It's much easier for the school just to not allow it.
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