I want to tell you about a bug that I learned in the experiments. The witch does not take damage in the lava. To do this you need to Spawn peasants to high altitude(instead of moved) when they start to take damage, wait for when the damage will stop. Over? We throw them on a small surface of 5X5 blocks. Go to chat and enter the command(it is necessary to repeat very quickly (about 7 lightning strikes cause) this command): /summon lightning_bolt
Once we see the witches fell into the lava lake, they are in lava not die (if you managed). They'll heal if we hit them. From them only comes the texture of the fire