Got something: instead of awkward potions making spheres of TNT, now they make special rings. These try to clear like materials from below them, down to the next available block. Works with awkward potions/TNT, web potions (slowness), webs, wood, log, and mossy cobblestone for the heck of it.

Fun to play with! You can make sort of crazy bridges on purpose using single snowballs, and the multipliers end up not placing that much TNT/web/etc.