Behavior: Both are Blind (poor targeting). They counter-attack the source of ANY damage with a poison spit (Fatty = Line, Meatball = Range 3). If one dies, the other Enrages or Explodes.
Tactics: Since they counter-attack blindly, try to position them facing each other (2 tiles apart). Hit one, and he will spit on the other, triggering a counter-spit. You can create a "Spit Perpetual Motion Machine".



