They are actually surprisingly easy to kill. If they are dry, just drop the water on them and they burst. Once I killed several hundred because I was an idiot and didn't want to gently rehydrate them before the breakfast :'(
Once they are dry or active - they are indestructable.
damn... how could you :)
I was young, wild and irresponsible :(
keep ya head up buddy, we all make mistakes in our youth :D