Predator and prey...roosting together (Falco peregrinus)

Since lockdown was partially lifted I decided to go to Cambridge city centre. I regretted that, since people came pouring out as if no virus was around, which made me mad. But I cooled down when I reached the place. I did see the peregrines, and at one point a pigeon flew in and decided to sit right next to the peregrine! The falcon watched the pigeon fly right in front of it and stared before turning away, uninterested. I have never seen this before- usually when I saw the peregrines pigeons took of in massive clouds from the building. This is the best image I have taken yet. In addition, there was high-pitched chirping coming from the nest site...