Scenario: someone asks: "Let such-and-such. How do I prove X?". I answer "Hint: because blah, blah, blah, all you have to prove is Y". Their response is to ask a new question: "Let such-and-such. How do I prove Y?".
See Proving a property of a Logic Formal Language and Proving some property of a Formal Logic Language for the case in point. The potential infinite regress bottomed out because someone else answered the second question with more details on how to prove Y.
I voted to close the second question. Should I just give up answering questions with hints?