So, I just had to get something from the pharmacy for my mother and on the way home I decided to sit down on aa bench to have a smoke.
I had my bike leaning next to me and when I stood up to throw away my cigarette I didn't have an eye on it for maybe 20 seconds.
When I sat down on my bike I immediately noticed that something was weird, the brakes who used to be loose were now pulled properly tight and the back wheel which had been missing air was full again. Even my light which was kinda running out of battery now seemed to be recharged.
When I came home and put my bike into the shed, both brakes immediately became loose.

Can anybody shed some light on this?

>pic related, my bike