Old-N-Feeble
Member
A partial double exposure would happen in case of
-) overwinding as I explained above
-) mid-roll transport-cancellation with added film movent (as pulling a bit the rewind)
BUT in both cases the image would be wider and with fine (non-double) exposure parts at both ends.
The shown image though is NOT of that kind.
So we are not yet at the end of the story.
We don't know that. We only see a partial image. We're not shown 'between' and 'beyond' the frame.