New fiddle player, i'm struggling with jngl clear.

i can in a way or another do the whole clear, i know it could be better, but i'll learn with time. The thing i still don't understand is what i'm doing wrong at krugs, am i too slow? did i miss something? in every attempt the big one always survive at less than 50 hp but never actually died, can you help me? what am i doing wrong?

ignore the fact the clear starts at 1.48, i was resetting the practice tool and skipping time just to try again the krugs and not to actually test the time of my clear. this try is the one where it got the closest to death, surviving at 13hp

https://reddit.com/link/1h115c1/video/p7tf6ewh5f3e1/player