I said I needed a better answer!
The Yo-yo cannot fall!
Your sentence "How could you sever the string without holding the yo-yo or the string in any other way, so that it would not fall" is ambiguous.
It says "How could you sever the string so that it would not fall" 'it' clearly being the string, with the conditions "without holding the yo-yo or the string in any other way."
I assume you're withholding a better answer and I think you should share it with us already.






