So, I am not making excuses for this game. But I think I can explain what happened here.
It looks like the Reyna shot where you would have been IF she actually successfully blocked you from rolling backwards.
I can’t even begin to pretend to understand what’s going on under the hood with this game. However, if you look at the exact point where you would have hit Reyna with your roll, that is exactly where the kill cam shows them shooting.
This has been happening quite a bit lately… that is getting killed from being shot where you were, not where you are.