It is a neat idea. However, it is difficult to see that this is an animation for being hurt or taking damage.
It looks closer to an attack animation.
I think the character should have an expression of pain on their face to make it clear.
Closing the character's eyes would make sense here.
Also it is visually confusing to see a shock wave coming from a character similar to a super hero and
see it as a weakness. The shock wave looks like it should be hurting the enemy.
Weakness should look small and contained within the character, something like becoming smaller, moving the entire body back, etc.
A good example of visually showing pain is this sprite sheet of Link for Zelda 2.
https://www.spriters-resource.com/resou ... 2/1611.png
Link is facing down instead of looking at the enemy in the eyes like normal; is falling / not balanced unlike his normal confident pose.
It has a huge contrast from his normal pose.