__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
Malak (prime) might be strong and capable enough to handle Vivicar in a strictly conventional confrontation. However, issue in this case is whether Malak can somehow handle Vivicar's plaque or not. If not, then Vivicar will win.
Bersen'thor defeated Vivicar not just on the basis of raw power but she had acquired a defensive technique to counter Vivicar's plaque earlier. Without this defensive technique, even Bersen'thor may not have stood a chance.