ok so the kb nemo has a 1.2% chance of dropping nd it has only knockback 1
there are multiple ways of countering it some of which are mentioned in this video: https://www.youtube.com/watch?v=2Ksi_O9Nb7g
there are other ways which include, digging down one block and jumping into the hole which prevents knockback completely, and theres an easier way of just running away until you are safe
also this post has been discussed SO many times , its getting kinda irritating
so heres the original forums post, discuss what you want there
and if you are still not satisfied with this message, check out this post where a forums user called Tar1a took time out of their own day to explain and advice some counters
https://forum.playhive.com/t/rebuttal-of-potatopie25s-video-about-the-nemo-and-fixes/35155