It landed in the reedbed just in front of me but landed right on top of another bittern - who wasn't best pleased. There was a brief fight, out of view, and the newcomer was unceremoniously dumped back in the water.
It swam around with its crest erect for a minute or so, trying to show it wasn't intimidated, but eventually took off and flew back to the bed it had come from.
I wrote before about the bittern's landing technique, which is to close its eyes, crash into the reeds and hope for the best. Here's another example. The colours on its wings are wonderful.
The original occupant of the reedbed briefly made itself visible to establish ownership, and then disappeared from view.