On arrival at the car park one of my birdrace teammates who was just leaving said that the Teal had been showing but had been lost to view in a deep channel. Foolishly, I forgot to ask 'which channel'. At first glance, there were a daunting number of Teal to get through, many of them distant and partially hidden in a slightly less daunting number of channels. Diligent searching produced nothing out of the ordinary. I tried counting them (300+), a good way to make sure I checked every bird. Still nothing.
With the light fading there was only one thing for it: resolve to give up, and have one last quick, forlorn scan while swearing a lot at the frustrations of fitting twitching in around a full-time job. This has done the trick before, and did so again, as the Green-winged Teal waddled up out of the channel and went to sleep on the bank in full view. Too far for photos, but some smart Pintail were a bit closer.