Umm, you have actually quoted Amhed, not BMZ.
Oops! There were so many sub quotes I must have left the wrong one. But I believe the issue was first raised by BMZ anyway.
No offence. No worries. I understand.
The point is that many folks discuss the word using English translation and that is not necessarily correct.
Father Abraham had 'ma malakat aymanayhe' but he did not capture them after a battle.
The words do not mean slave. If one is the Man of the House, then all occupants within one's own household such as wife, children, slaves (males and females), parents and others, will be under him. This is a huge subject and I cannot do it all now as it is past midnight. Will do it later in short bites.
Good night
BMZ