The apparently scallop-backed bird left of centre is clearly the putative Ruff, I think.
Seems to me from this quality of image there's just enough about the head to suspect it probably is 'just' a Sharp-tailed.
Do we get a 'solution'/better quality image of the mystery bird?
Also why isn't the bird in front of it, with its backside in the air, a Wrybill?
Mike Turnbull