I don't know if this is an already known issue but this is happening to me:
If you make a zombie bleed, it spills poison, ok.
If you make a zombie bleed in a river, it spills poison INFINITELY. I was in a fight for like 5 minutes (at the entrance of the dungeon of the adventurers quest) and when i look back i saw like 5 to 6 screens wide of poison in the map, it was starting to make my fps drop so i burned all of it, it was kinda fun.