Electro's static damage back relies on a % of what hit him. He must survive the hit to reflect damage back. Heimdall ensures he survives at least one hit, and endures at 1%, no matter how much damage is done. The defender technically would do hundreds of thousands of damage, and only have a % reflected back, but in this case, the damage is so great, its enough to kill them in one shot.
This can be expanded upon by bringing thor rag with those two, start the fight, regen to 18%, then same strategy, patience, get hit, survive at 1%
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This can be expanded upon by bringing thor rag with those two, start the fight, regen to 18%, then same strategy, patience, get hit, survive at 1%