Barred Owls dueting in the batture

I have long regarded Barred Owl as an irregular winter visitor in the Old Jefferson area, occasionally wandering in from the swamps outside the city, never nesting.
Thus, I was surprised on Wednesday when, during a walk along the levee, I was treated to two individuals calling back and forth. They were giving their classic "who cooks for you, who cooks for you all" calls at 11 AM (!), with one bird being decidedly higher pitched than the other. Male owls are generally smaller than females, and I presume the higher pitched bird wad a male, calling back and forth with a lower pitched female. I wonder if they are thinking about nesting there....
Peter