This close (though it is dark, hard to see even with this close space), Tidus can tell too that Inigo doesn't have the same energy about the idea as he does -- and where's the fun if Inigo isn't up for storming a haunted house as he is? So while Inigo does acquiesce-

"I'll protect you from anything." He lifts his head, turns and points off towards the exit. "--or we can go out and see what else they have going on!"

Whichever they go, Tidus doesn't care. He's sure to have fun regardless.