[ and that's the important part... trying... though leo is absolutely tactless and sometimes ruthlessly honest, so what comes out first is: ]

Wahahaha! Ahh, I haven't heard that shameless of an attempt in a while! I love it, Ko! Don't stop singing, okay?

[ he says it's terrible but he's encouraging cole to continue... while just snapping a nickname he's absolutely not explaining, it's fine. ]

You gotta try and relax a little... Like, really let yourself go! Don't just talk melodically. Take all your feelings and let 'em tear through your [ singing again, a little louder: ] twin ♪ kle, twin ♪ kle! Go, go!

[ he is saying this like twinkle twinkle little star is some metal screamo song but that is absolutely what leo wants at this point ]