If a rolling shutter travels from top to bottom, why does this image seem to show skew in the other direction?

In the picture below you can see that the rolling shutter moves downwards...i.e., it exposes the light to the sensor from top to bottom.

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So the information that the sensor recieves is a bit earlier at the top of the sensor and at the bottom it is a bit late..

But the image is flipped(inverted) by the time it reaches the sensor...

so the sensor recieves lower part of the image earlier than the upper part..

But in this image below...as you can see the shadow of the cork appears even before the cork had come out ...this means that the upper part of the image reached earlier than the lower part....how is this possible..??

I'm new here...I'm really sorry if i went wrong anywhere....I hope you answer my question...

Answer

You are correct that the image is inverted as it is projected on the sensor and that the mechanical shutter reveals the bottom of the scene before the top of the scene. What you have missed is that the image (with the shadow of the cork falling on the red shirt at a later time than the the actual cork is seen flying through the air) is not a still frame taken using the mechanical shutter - it is a frame capture from a video recording.

During video recording the mechanical shutter stays open. It doesn't cycle between frames. The sensor itself is read out electronically in the opposite direction from the direction that the mechanical shutter normally moves - the sensor is read starting from the bottom of the sensor as it sits in the camera which is the top of the scene in front of the camera due to the lens' inversion. As the host in the video that your image is from explains, the photo in your question is a frame grab from a video recorded with the camera, not a still image recorded using the mechanical shutter.