Pinnacle Boss - are we suppose to have unbeatable combos?

this might seem like a random rant, and may be i am just ranting. BUT, are we suppose to have a boss that have unavoidable combos?

The lazer thing is hard to dodge, but i get it, it's meant to be hard, im not sad that i can't dodge and die to it all the time.

However, when i try to dodge the all screen fire thing by standing in the circles:

1. is the normal that the boss cast a skill that will 1 shot me in the circle?
2. is it normal that the circles are too far away from each other that i can't get to it in time even i leap + dodge rolled?
3. is the boss supposed to cast the skill where he jumps to the air and strikes you, then you are stunned for .5 sec so you can't get to the next circle in time?

in general, is the boss suppose to cast anything when he casts the circle thingie?

I know im just an average player and these bosses are supposed to be hard to beat. But is it possible the boss mechemic is messed up now that some times you just can't beat the boss?