So if Twitter wins Musk has to go through with his margin loans on Tesla stock. Ehich, at the current state of things, exposes to quite some risk of loosing tge ability to back up the loans with Tesla stock if share prices drop under a certain level. Maybe he just realized that risk and that's why he wants out.

Musk doesn't have to use his Tesla margin loan, and he's already claimed he wasn't going to.

He has to get the money somehow, but he could just sell enough SpaceX if he felt like it.