As you can see, you need 6 fire or 3 harm to both squish the corpse (ending the encounter) and get some loot. You can squish is with 4 infection, but that doesn't give you loot. Meanwhile, as you can see in the pannel of the middle character, your spell deals two harm to target and one harm to adjacent enemies. So it's not the most efficient way to do it, but what can you do? Also, you need two pyramids and two swirlies to cast it, and that's almost an entire different system.
