I think it also depends on the personal background one specific flying monkey has/had, eg when someone grew up in an abusive surrounding being either a victim to the abuser or abused as a flying monkey from a very early age on, I think this person is often prone to fall prey to an abusive person later on in life, again, being either victimized directly or "indirectly" by being abused as a flying monkey.
Also I'd say it matters how close the relation(ship) between the abuser and the flying monkey was. I bet there are different "grades"/"level" of flying monkeys, but this is just a thought of mine, haven't read up on that yet.....bet Richard Grannon or Sam Vaknin have already explained that in some of their highly informative videos.