Mauro, those are wonderful, real, people pictures! I would guess your Barnack's shutter was preset, the collapsible deployed, prefocused and f/set before the camera came up to your eye?? Right? Wrong? Details are interesting!
My take, after using all kinds of cameras, is there is no better tool than a preset, palm-of-the-hand Barnack+collapsible for invisible 'passage', then nailing A decisive moment. Fast second and third shots aren't the LTM's strong point, but what good is a giant, bulky (wink) M, or S, or whatever after the 'moment' has passed.
Oscar's camera hasn't been around forever for no good reason!!!
Bruce