It's got to be a count to three with a build up. And so-

"One... two..." You ready, Romeo-!? Tidus is putting his fingers over his nose to pinch, his other hand close to his mouth! "--Three!"

And it's holding their breath time! Tidus isn't expecting a big difference between Romeo's times, but he's here to count the seconds with him, cover his face the same way as him too. Good luck buddy! Even a minute would be amazing...!