Ok, I did it.
I should be proud of it as I didn't think I could do it.
I jammed one of my lenses.
Without thinking I removed the lens from the body while it was still attached to a tube and then I removed the tube which resulted in the cocking to move to a position that doesn't let the lens be attached again.
If you notice, the coupling mechanism doesn't line up with the red dot.
I noticed that it can turn freely clockwise but it springs back to the same position after a turn.
Is that something I can fix by myself or do I need to send the lens to a technician?