On this fabulous site where 10 odonates take off at every step, I was taking pics of something else when my eye perceived an unusual movement. My favorite form of Blue-tailed Damselfly! Its strange flight becomes clear... It has a sized prey in the mandibles, nested between the legs for a big cuddle... Well, maybe not!!!
The unfortunate Common blue is slightly bigger.
Enallagma doesn't look like much anymore but hangs on bravely: