The AI in Underrail is pretty bad. You can use kiting everytime you want to heal, come back to kill another one, etc. The enemies are completely dumb, clueless.
Zone reentering is a chance for not enough strong players to win unwinable fights. There are people who do not like save scumm to win fight or to get initiative on their side.
Because it's the guy who is shouting "BUUURNS" thrown grenade into me while he and his own 3 people were still alive. He killed himself, 2 of his own, and wounded 4th.
But it is good for you. Are there no such situations in the real world?