Harmony - Troop Symmetry

Path to the Supreme Unit:
1. Haven
- light magic
- leadership
- defense
2. Inferno
- destruction magic
- attack
- leadership
3. Necropolis
- dark magic
- sorcery
- creation magic
4. Sylvan
- light magic
- luck
- creation magic
5. Dungeon
- dark magic
- destruction magic
- sorcery
6. Academy
- sorcery
- education
- engineering (machinery)
7. Fortress
- defense
- engineering (machinery)
- sorcery
8. Stronghold
- leadership
- attack
- war cry

Added after 20 hours and 48 minutes
I have a question:
from my observations - when the "empowered arrow" skill triggers (the target unit is pushed back one cell on the battlefield), the knockback effect on the attack value scale doesn't occur, but the skill description clearly states that it should - what's the problem?