Twist the Ether and "AE" damage

I apologize if this has been cleared up in another thread. I swear I remember reading about it somewhere, but I can’t find the thread, so maybe I’m just crazy. If I have Twist the Ether out and something deals multiple doses of damage (i.e. “All heroes take X damage”), does Twist the Ether change all of it to a single damage type (i.e. cold → fire), or does it change a single instance of that damage (i.e. Legacy takes the regular cold damage, but Ra takes fire damage)?

If it says something like “All heroes take 2 cold damage”, you could use it to change damage to all heroes to fire (or whatever else you choose). If it says something like “All heroes take 2 cold damage and 3 fire damage”, you could change it to 2 lightning damage and radiant damage. However, you wouldn’t be able to split it up by hero and say, “Ok, Ra takes 2 fire damage, and Absolute Zero takes 2 cold damage, and Fanatic takes 2 radiant damage, and etc…”