It's an....odd gesture, but it makes Tidus think of chocobos. A little. But he gets what Taiki is doing through his voice that sounds clearly despite the newer form.

But-- if he doesn't have to apologise, what else is there to say? Tidus struggles to find his voice, holding onto the cloak tight.

"I made you have to heal me..."

Even if he doesn't say sorry, he speaks it apologetically.