Inigo grabs Tidus' hand the moment it's offered to him. Despite the insult! Or rather, he does it before he can even hear it, since there's not even a beat between Tidus offering the hand and Inigo grabbing it. It just happens that quickly since it's all instinctive.

Once he is standing upright on both feet again though, the words finally seem to register with him.

"Why is it my fault for getting spooked! It's your fault for threatening me!"

Yet Inigo's dramatically worked up tone makes it hard to believe he really thinks Tidus threatened him. Surely the guy wouldn't really throw him overboard knowing he can't swim, right? .. Right?

It's the sound of Taiki laughing that completely quiets him for a moment. It's hard to be dramatic in the face of that much cuteness.. So instead he just nudges Tidus with an elbow.

"Taiki is right. We both work hard." Don't say anything else in front of Taiki now! Don't you dare ruin their cutie friend's mood, bro!