Retrograde Mangala: rules 11 and 6 house(s)
Retrograde 6th lord is good. Enemies and illnesses are weakening, creditors may not demand to repay the debt immediately, agree to deferrals. It also suggests that some enemies and illnesses (or their absence) are associated with the karma of past lives.
A retrograde lord of the 11th house can make a person unambitious and/or delay the fulfillment of desires.
Source: Rami Bleckt