I'm new to dragonflies and damselflies, and was very surprised to see this. The victor hovered in the area a while (guarding eggs?) and the vanquished didn't resurface that I saw.
Canon 7D2, 100-400 II with 1.4X III, handheld at 560mm. ISO 1600, f/11, 1/1000 sec. Very basic LR adjustments and a very small amount of smart Sharpen on the resized JPEG.