These two met up on the same tree. They interacted for a while then went their separate ways. The black one approached the brown one from behind. The brown one then hunched up and flicked its hind legs. Its head was bent down with its nippers touching the branch of the tree. It was an interesting interaction to watch!
Found this different guy hanging out with homalictus urbanus bees, unsure of species or behaviour. Roughly same size as bees but a little smaller