There's the problem of blood being difficult to wash out of tennis balls, alas.

I swear, when she's angry, she's more shrill than a vocaloid. But I think since I get into less media trouble and more 'can I kill them' trouble, she has a reason to be upset....

[ooc: Much better than Mori XD Yukimura really doesn't like Mori. But yes, sometimes he likes to debate hypotheticals]