For a Horseman's 1-damage effect to Heroes in the Villain's Location and adjacent Locations, is it one damage split across Locations or one per Location?

Question

Accepted Answer

One damage is dealt among Heroes in the Villain's Location, then one among Heroes in the left adjacent Location, then one among Heroes in the right adjacent Location.

Marvel United: X-Men

For a Horseman's 1-damage effect to Heroes in the Villain's Location and adjacent Locations, is it one damage split across Locations or one per Location?