When playing Deadlock LV (4v4 online match, Warcraft 3 Reforged), my blademaster bought an Orb of Darkness from one of the stores near the middle of the map.
He was alone (e.g. not with army or other units or heroes) and he killed 10 [human] peasants and only had a single Dark Minion spawn.
The dark minion that was created was moved away and he wasn’t doing the last-hitting either.