This image was taken near Kota Kinabalu, Sabah, yesterday by Karim Madoya. The bird was alone but he estimated it to be about the size of a Red-necked Stint. It drew his attention because of its very fast feeding action, much faster than a 'normal' RN Stint.
I've only had chance to view this one image. The bird looks to be a 'first winter'. It may just be the angle, but the primary projection looks long, and that kinked supercilium is unusually prominent. It may just be a 1st w Red-necked Stint, but I'm wondering why it isn't a White-rumped Sandpiper. Can those more familiar with that species help?