Inferno dealing uneven unclear damage

[Kingstad]

This is largely about how I feel its more intuitive that a carpet of flame deals even damage in its AoE instead of it tapering off from its center like an explosion.
Since infernos ground fire stacks I originally wanted to figure out how much damage two stacked missiles do. But turns out their damage will vary a fair bit depending on the size and shape of their target so there is no good answer to "how much damage does inferno deal".
Additionally however is the random nature of afterburn, it's a small detail but its a strange one, perhaps there is a good reason quantum made it that way idk.
So two infernos fired at a fusion will deal almost precisely 2200 dmg, but because of these variables its random if it will die, some times it will, sometimes not.