How to Complete Oh No, Kupo!
The objective is to gather all of the machinery parts. The quest will end after you check all of the sparkles on the ground.
The enemies here are three Bombs, a Grenade, a Worgen, and a Headless. The law forbids Harming the Weak, so if possible, you should only send out units whose levels are less than or equal to the enemies' levels. If that is not possible, then there is no way to avoid breaking the law. Remember that you will also break the law if one of your higher-level units hits one of your own lower-level units.