Onslaught R4 polka dot fight in Aw

Hi All,
I am just curios to know how these guys taking special 2 or combos from onslaught R4 and still surviving with so much health. I have done the same node with same boosts. However, even a single combo on my block itself onslaught or photon was doing 10-20% health from R4 defenders. Here in the below video they are taking sp2 and combos still loosing so little health. I would be glad to know if there is mastery setup to reduce the damage taken. Any input is appreciated:
https://www.youtube.com/watch?v=KI6fQ6YX_jo&t=9s
https://drive.google.com/file/d/1q1ws0oMbWKz6kn9VdBTAKUre4LU5gzq5/view?usp=sharing
In both the videos they aren't taking the damage as I was taking from the same node with onslaught his damage was very high just through block on me itself. Any insights on this is appreciated.
I am just curios to know how these guys taking special 2 or combos from onslaught R4 and still surviving with so much health. I have done the same node with same boosts. However, even a single combo on my block itself onslaught or photon was doing 10-20% health from R4 defenders. Here in the below video they are taking sp2 and combos still loosing so little health. I would be glad to know if there is mastery setup to reduce the damage taken. Any input is appreciated:

https://drive.google.com/file/d/1q1ws0oMbWKz6kn9VdBTAKUre4LU5gzq5/view?usp=sharing
In both the videos they aren't taking the damage as I was taking from the same node with onslaught his damage was very high just through block on me itself. Any insights on this is appreciated.
2
Comments
Same onslaught fight when I did block damage was 2-3k block. It's almost double than they took on their basic combos. How is that doable?