Board Thread:Fun and Games/@comment-28362353-20171009152445/@comment-32233739-20171113074943

personal opinion on UI... its accessed the exact opposite way of super saiyan.. hence he can't seem to use it at will, but when when he's so tired he can't think straight, so he just doesnt think, and this is what causes him to reach UI....

against Jiren, he had been battered and almost killed, couldnt fight back so his body did the fighting back for him

against Kefla, not getting battered as much as he did against Jiren but he is already worn out and with Kaioken, Goku was extremley exhausted - probably couldnt think straight and he just shut his mind down and then, boom, UI reached....