Basically ML is of mixed blood of some race and FL is pure blood, not of that race. The race that ML has mixed blood of can only have children with people that have blood from that same race, so he's unable to have children with FL who is pure blood.
Basically ML is of mixed blood of some race and FL is pure blood, not of that race. The race that ML has mixed blood of can only have children with people that have blood from that same race, so he's unable to have children with FL who is pure blood.