Practice Tool Dummy Bug
You can kill the dummies in practice tool if you spawn the max number of enemy dummies and damage them, and then spawn a new one at your fountain using the minimap so it teleports one of the dummies to your fountain instead since you can't have more dummies. This negates their invulnerability in enemy fountains and makes them take fountain damage. This also works with the bot, if you spawn the dummies and the bot damages them you can teleport them to enemy fountain and they die.