Henry came along and was surprisingly well behaved except for his insistence on trying to "help" with the landing of the fish.
It was a breezy day and the drake were around in batches. One moment the river was devoid of drake, suddenly there would be many dozens for five or ten minutes and the fish responded favourably. Then it would all go quiet for a while until it started again maybe half an hour later.
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Of course if wading was allowed here it would have been a simple thing to approach from directly below and make the easiest of casts to betray the fish, but then the merit of this "meritocracy" would just disappear making both fish and anglers all the poorer for it.