Nah, I don't think they've quite yet grasped the fact that you are only allowed to KICK the ball. (Though what referee, not Shiki, would be brave enough to send one of them off for that)
ChaoticJ said: And yet we already know what happens when the gals from Gensokyo get around soccer balls.
HIT THE DECK.
In case the ball has been infused with hourai elixir, then yes. If not there shouldn't be that much of a danger. I doubt a non hourai elixir infused ball can withstand the punishment the Touhou girls will inflict on the ball.