Bug or not?

I was fighting Redhulk in arena. Was using Luke cage,Rhulk used his Sp3 on me and it took me down to 48% health. But when the animation was over all of a sudden my health went down to less than 10%?! It's like the "incinerate" damage was dealt all at once because I was not incinerated after his Sp3. This supposed to happen? Sorry I do not have video proof cuz idk how to do all that lol
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He had 10 charges. He did not incinerate me. More like the incinerate bugged out and just dealth all the damage instead of damaging me over time