Cannot pass the 1st test and don't know why...

I guess I fail the first test, and I don't actually understand why. When I follow the prints, it all looks pretty logical to me, and I don't get where exactly it went wrong. My code is attached if you want to take a look. But most probably the logic is what I did not understand.

The test:

unit_1 = Warrior()
unit_2 = Vampire()
weapon_1 = Weapon(-10, 5, 0, 40, 0)
weapon_2 = Sword() # h +5 a +2
unit_1.equip_weapon(weapon_1)
unit_2.equip_weapon(weapon_2)
print(fight(unit_1, unit_2))
assert (fight(unit_1, unit_2)) == True

Outputs:

- Warrior equipped weapon <__main__.Weapon object at 0x7faa62e91c90> now health is 40 and max health is 40
- Vampire equipped weapon <__main__.Sword object at 0x7faa62e91cc0> now health is 55 and max health is 55
- Vampire is attacked 10 45 55
- Warrior is attacked 6 34 40
- Vampire is healed by vampirism 50 % 48 55
- Vampire is attacked 10 38 55
- Warrior is attacked 6 28 40
- Vampire is healed by vampirism 50 % 41 55
- Vampire is attacked 10 31 55
- Warrior is attacked 6 22 40
- Vampire is healed by vampirism 50 % 34 55
- Vampire is attacked 10 24 55
- Warrior is attacked 6 16 40
- Vampire is healed by vampirism 50 % 27 55
- Vampire is attacked 10 17 55
- Warrior is attacked 6 10 40
- Vampire is healed by vampirism 50 % 20 55
- Vampire is attacked 10 10 55
- Warrior is attacked 6 4 40
- Vampire is healed by vampirism 50 % 13 55
- Vampire is attacked 10 3 55
- Warrior is attacked 6 -2 40
- Vampire is healed by vampirism 50 % 6 55
- False