I started with AF, then I got tired of seeing my lens hunting for a little bird out of a large empty space, I switched to manual. So both pics could be without AF. The second one the birds just flew off the box and so I sort of pre-focused around that area in advance and adjusted when necessary, which pretty much was all the time The third one the bird was even farther away. So it was a bit easier to follow the swallow especially since it was making a big turn.
A guy came by and stood near me for a moment. He probably was wondering what I was doing since there was no eagles, no herons or any other bigger, exotic birds to be seen. He said nothing and left. But if he asked, I would have said: "I'm trying to do the impossible."