Ahriman
Tyrant
why cant we make it damage both?
Because it really doesn't make sense that an exploding flame cannon will damage the entire enemy army. And the cannon backfiring as its destroyed is supposed to be a penalty, not a valuable retributive strike.
Technological weapons that explode doing damage massive damage in a huge radius just isn't very dwarven. Ork or chaotic, sure. But it just doesn't really fit here.
And I'm not sure it passes the "does this make sense" test. Is a cannon blowing up really going to damage more than other units in the same artillery battery and their crew?