Apparently Tidus spots a Blitzball-shaped object and decides to kick around with it. But the ball turns out to be a bomb and it unceremoniously explodes, taking off Tidus's head somehow. Yuna is knocked back by the explosion and the next thing she knows, his decapitated head lands next to her, etched on it the lifeless and frozen gaze of surprise. Yuna, naturally horrified by this particularly gory yet cartoony untimely death, passes out. Later on, she would resurrect Tidus again, and there all the problems between them allegedly begin. Something about Yuna not wanting Tidus to be aware of what the heck he actually is(?).
You know, even though this whole expanded universe stuff is unnecessary, there are some potentially good little places you can run with this:
1) By having the Fayth dream him back when they weren't supposed to, has Tidus's resurrection the first time done some unforeseen damage/adverse effect? That's worth exploring.
2) Has it worsened by Yuna requesting his return a second game, hence the barriers between the Farplane and Spira beginning to substantially blur and totally screw up the metaphysical order of the world?
BUT Nojima just has to make this as difficult to seriously swallow as possible. The alleged events of Tidus's second death just elicits some laughter from me, and I can't take it very seriously. Nor can I take seriously the fact that there's sexual content/references strewn around. Hence why I suggested that FFX-3 should feature Tidus as South Park's Kenny, because at this point, they may as well roll with this fantastic dark piece of humour. Then there's the tween drama edge to the audio drama that in itself sounds utterly insufferable - far from the appealing starting point for any potential FFX-3.
My god they are serious with the head explosion stuff? Haha I would love to see this just to be ultimately confused by it all. They make Tidus sound like a **** who can't figure out what is and isn't a blitzball. Why is there a bomb just sitting there anyway? Ugh this wondrous story has seemed to stroll away from what it truly was all about. Should have stuck with FFX but FFX-2 was good to some people and brought about that happy ending. Just cast aside all of this that's all I can say. It sounds like something I could conjure up on a jokey afternoon haha