She'd like to deal with this as quick as possible, before word spreads and there's any more trouble.

However, to the kappa, a piece of technology like this is to die for.

If they heard that their fellow Mountain-dwellers, the tengu, destroyed it without asking them, they'd be angry at the very least.

Regardless... if she doesn't act carefully... Either her status in Gensokyo or her status on Youkai Mountain comes under threat.

In that case, "Yakumo took care of it before the Mountain could get involved"

is the perfect way to put all the blame on someone else and weasel out.

Hahaa. I understand the situation now. Personally I think it feels like a waste to just sweep it under the rug, though.

Guess she really needs me around to advise her.