She doesn't ruin it, per say; Tempest has been dancing around the real reason this entire time, after all. And she ends up bursting into laughter at Chloe's response, because she isn't sure who it's directed at, but can't help but agree either way.

"I think . . . there has been a misunderstanding, but yes, piss on the ones responsible. Or rather, their graves."

Because she's pretty sure most, if not all of them, are dead thanks to her.