Ok, so I just got past the marriage to Seymour, and afterwards Seymour orders everyone killed. Yuna says to stop, or else she'll jump off a ledge, so everyone lowers their guns. But then Yuna jumps anyway, forcing Rikku to use a smoke bomb in order for you to make your escape.

I understand Yuna needed to jump to escape, but why do it before she secured the release of your party? If she was that worried about everyone being killed 5 seconds beforehand, then the party was still at risk immediately after she jumped. And if she wasn't worried about Tidus and them being killed, then the whole dramatic show was pointless.

Am I missing something? Or was Yuna's thinking affected by her wedding cake being laced with meth or something?