Here you see the effect enemy corpses have on the Focused Aim skill, which should give +10 Damage if no enemy is within 5m.

In the top window you can see the skill active next to my armor ability. In the bottom window you see it has vanished, because I took a few steps toward the enemy corpses.

In my opinion, corpses should not count as enemies towards the prerequisites of Focused Aim, thus I consider this behavior a bug.