“and will be charged as Obstruction of Justice.”
Bingo. Recall a late hire by the Mueller inquisition was an attorney skilled in obstruction matters? Everyone thought it was for Trump. No, it was for those who talked to this slime ball and offered some degree of advice.
My advice to anyone faced with someone showing up out of the blue and asking pointed questions about anything that may be considered illegal is simply say: I have no idea what you should do or what you are talking about. If they follow up with remember we discussed this, to simply say I don’t recall any such conversation, you must be dreaming.
I would just say “I’m not qualified to give legal advice. You would be best off having this conversation with your attorney”.