I set the exposure time to 6 seconds and used a very small aperture. The ambulance being too dark and also moving too much makes it not “stick” on the photo. But the flashing blue lights stick despite moving because they emit a lot of light. You can also see the people in the background were not completely still, so they are all blurry.
Thank you! The story behind the photo is way less interesting than it might seem. If you want to ruin the magic for yourself I added a spoiler element to this comment that you can expand if you really want to know where and how I got this shot.
This photo was taken at the amusement park where I live which has been temporarily Halloween themed. The character in the shot is an actor in a costume employed by the park. In the un-cropped version attached below you can see other park visitors and the entrance to the toilets.
Check Forgejo out, they are currently working on federation through ActivityPub. Might be something for you.
https://codeberg.org/forgejo/forgejo#what-does-forgejo-offer