Common Green Darner Dragonflies Laying Eggs

We had 2 different Common Green Darner Dragonflies laying eggs in the pond within an hours time. The first was there for about 20 minutes, which seemed quite long. Then the second flew in to the far side of the pond and stayed for about 40 minutes. A Blue Dasher buzzed it and it flew off and then came right back in a different spot and continued.