Setting a blob on fire is A) Murder, as they're described as sentient, but I think Ville simply meant "living", so maybe not so much murder as animal cruelty. B)It's not really an effective tactic unless the blob's AI gives it the aggressiveness of Duke Nukem 3D's Protozoid Slimes, and they inherently track enemy creatures. C) You'd have to have a flamethrower, I guess, since using firewood right next to one didn't do the trick.
Additionally, why wouldn't emptying an ether container give you an "empty container"? It seems counter-intuitive to have said container simply dematerialise otherwise, unless they do that by design to prevent littering. But I don't think Ville thought that far ahead, or did he?