It has a rather negative effect on the slingshot hobby, as many people are now afraid of returning balls.
I have looked at the video another time and found that the pouch design and - mostly - the grip technique the poor woman used were the cause for the epic fail.
Returning ammo is - from my point of view - always caused by a twisting pouch. These twists can have several reasons, and a shooter is well advised to avoid all of them.
a) Bad pouch design, with basket or bowl shaped pouches
b) Bad rubber/pouch attachments, using attachment points at the pouch corners rather than in the middle
c) A release technique that releases the upper or lower side of the pouch first
The (still) biggest forum for slingshots (I no longer use it) recommends a narrow fork, but I disagree - the fork width has no influence on such issues. I have slingshot crossbows that feature 70 cm fork width, and no such issues ever occured. I think this theory is scientifically unproven and more like a superstition than a fact.
In the case of the watermelon woman, a), b) and c) have caused the fail.
Let us look at the pouch first.
The band attachment is also very dangerous because it twists the pouch easily. If you pull out slightly off center, the upper and lower bands won't be stretched evenly, and this leads to twisting. Look at the shot, taken right after the release, with the bands still swinging.
You can see the twisting - and that was a SUCCESSFULL shot.
She did in fact draw out nicely, for the most part. See her draw before the success shot:
Now see how she drew out when the shot failed:
Now let us look at a much better pouch design - employed by my slingshot cannon.
No twisting, just a totally clean release.
If course, it is harder to draw out a pouch like this with your bare hands. A mechanical release makes a lot of sense. Just an upscaled version of this here would do the job just fine:
So - I think I have demystified the video just nicely. I may make a small scale model and record the effects in slow motion, someday soon - it is on my list of future projects.