There was an idea here, but an idea isn't a plan. That idea wasn't 'headbutt Inigo', but that's what happens when you're frantic and desperate and don't think things through - you get a pounding in your head, eyes creasing shut and a hissing turning into a groan thereafter.

He's stunned just for a moment, but after that, he slowly opens his eyes, hand on his head - and he sees Inigo gone. He reaches down to grab at the worm, but all he finds is his chin, and his eyes dart to where Inigo is crumbled, and--

he sees it.

The rest of his worm. Broken.

Tidus groans, as much as an tantrumming young kid would do.

"Ughhhhhhhhh- you're impossible!"

Yes, he's whining - even as the guy who isn't dead on the floor right now.