They don’t redirect the stream and destroy the area until after gold is found. That’s the next video. And if they don’t do that they’ll keep doing this which after about a week of hard work will leave that area unrecognizable.
It's already in your pan, so why not just paint it down real quick? Instead you take it out of your pan run it through your sluice then take it out of your sluice, put it in a bucket, then take it out of your bucket put it back in your pan , then pan it down... just so you can make a video that shows you used the sluice box? Really don't understand this technique.