(2) Black Winged Kite - Nesting (?)

Observed 2 of these nearby a pivot field in AQdra. Interesting part was that one of them was sitting on top of a tree while the second one was picking up pieces of dry grass / branches and taking them inside one of the trees (at mid range). I interpreted this as nest building. First set of photos are for 1st bird that was standing on top of the tree. The other photos are from the 2nd bird picking up branches and the tree it was going into, leaving the branch and going for more.