Every year the pond is inhabited by a changing population of Hydrometra stagnorum . Like the year before this year their numbers were small.
A small wasp I tried to photograph fell into the pond. Its struggle immediately drew the attention of two of the bugs which approached it cautiously.
I wanted to know what kind of wasp it was and therefore rescued it from its unlucky position. It turns out to be a male Proctotrupidae sp. , see here.
References1 Nederlands Soortenregister