By skin flap, I was referring to any flaps of outer skin that were torn loose. But these flaps are only good for use as skin grafts as long as they still are connected to a blood supply. Once the blood supply is cut off, the flap begins to die and can't be used. You did what you needed to do by...
Don't trip off any loose skin flaps. Coat the underside well with wound ointment and stretch them over the wound. "Glue" in place with a generous amount of ointment over the top. Don't try to bandage. Keep moist with the ointment or Manuka honey.