Well from my understanding of how the vines grow. If you clip the end of the vine it will not grow any further in that direction.
If those are the only watermelons you are wanting you might think about pinching off any extra's you do not want, letting the vines grow a bit longer for more photosinth to help grow the current melons growing, before pinching of the ends to control the size of the total plant.
My sister does watermelons fairly often and the vines will do whatever they want and go everywhere you don't want them if you don't actively control them.
She had a number of melons growing in the woods on the back side of her patch and she never found them till she could smell them. (way to late)
I think what you do depends on what you are wanting from the plant and how much you think you can sacrifice to it.
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