Leo spent a lot of time in the nestbowl, he arrived at 00:59 and stayed until 04:49
Most of the time he was standing still and looking handsome but he also acted several times as if Lotte was not so far, he bowed and clucked and hooted
Then, at 04:44, Lotte must have been landing on the ledge also, one can hear her call and Leo flew out to meet her. Immediately afterwards he came back to the nestbowl and was busy showing Lotte the place.
I think the fox comes back because there is a lot of mouse traffic around the nestbowl and on the ledge during night time.
When I am checking my night recordings with fast-forward I can see them scampering around.