Obviously that's a cruddy paint mockup. But I think a damage bar like the one pictured would make it easier to quickly see where damage came from. Perhaps it would be a good idea to include a second bar that lists damage percent by champion as well (possible ignoring type for simplicity). The thought is essentially that numbers are hard, but pictures are easy.
Pie graphs couldwork as well.
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Making the death recap actually useful is always nice.