Sometimes enemies drop tonics with buffs. These are instantly usable although they are still owned by the enemy.
Steps to reproduce:
- Defeat a strong enemy with the appropriate looting table (like a big Stone Golem)
- Get a buff tonic dropped (for example, Strength Tonic)
Since anything the enemy drops is still owned by the enemy (red outline), you should use it only after one of your hearthlings picks it up.
The tonic can be used instantly, i.e. right from where it was dropped, showing “Loot”, “Move item” and “Use” at the same time, so ownership has no effect.