Devided krugs have one less lvl than their original, and killing the originals will kill the divided

If the original krugs (big and medium) are (for example) lvl 2, their divided parts will be one less lvl than them. So you will get 2 lvl 1 medium krugs from the big krug and 2 lvl 1 small krugs from the mediums krugs.

Also if you kill one of the originals and then leave the camp, when they return to the camp they will stay alive for another 10 seconds and will then automatically die.