Stein = Sasuke Which means extra fast in Fire and especially lightning, Read he didn't used MayflyTo use kirin, yes you have to wait a full turn for the clouds and conditions to form then you have to say.... "I use chidori to control the lightning and use kirin" Or something along those lines.
But when it comes to it, i think mayfly can escape as long as its used as the opponent uses chidori taking control of the lightning... like when sasuke did, but i think once you control the lightning its too late.
Unless your a sensei its not your job to post here neither is it mine, but atleast im not going to waste my time trying to flame...
Edit: Im fighting him for personal reasons, and like this was for personal reasons.
Btw, This isn't flaming but talking about serious stuff.