I think it's the Jecht Sphere scene in which Jecht gets hit by a bolt of lightning, and Auron makes some slightly derisive comments. It's filmed by Auron.

Hold on! You look tired, you should take a breather - Auron and Braska caution Jecht against trying to dodge a bolt.
Tell me, way out there, how's the weather? - Auron and Braska are under shelter, while Jecht is out in the very stormy open.
*Hic*! Now you're not so tough... - "Now there's a scene for posterity!"
I burn, but don't bother packing Crimson stuff - Auron and Braska burn with laughter, while Jecht burns with embarassment (Not to mention some nasty lightning marks)? Not so sure about the 'Crimson Stuff' bit...