Skeletons shoot arrows faster than humanly possible

What I expect:

Skeletons reaction time is reasonable.

What actually happens:

Skeletons shoot the very moment line of sight is established. Even if they're facing the other direction.

Steps to reproduce:

1. Build an L shaped hallway
2. Spawn skeletons on one leg of the L
3. Walk to the other leg then walk around the corner
4. Get shot before you can even blink