So i was doing my initial completion of 6.2.6 and decided to take my 5*r3 she hulk against champion boss to drop his health from 100%-10%.The slow debuff from she hulk was removing unstoppable effect but it was not preventing it from getting activate that's not an issue but the only issue is that in 70%-40% (opening bout)

phase of champion boss there's one of his ability that if he we hit him while he has an active unstoppable buff we'll get stunned. I used 9 revives but i was not able to beat him in that form. So i don't know if it's a bug or not but i saw it on YouTube and their slow debuffs was preventing unstoppable from getting activate.