He is probably on margin and any further drop may trigger a margin call and his broker closes the position.Ride it out until expiration, It will probably expire worthless and you'll be in the money. I see TSLA above $500 by Friday!
Your idea is good if he can afford to wait it out.
Frankly, I had been there, tried all the different "mitigation plans" including roll down, roll out. I came to the conclusion that the best for me was just simply closed it out, took the loss and called it a day.