Selling/Buying a Future in NRML

What happens when one sells a Future in NRLM and the underlying stock hits lower circuit ?

Does it affect the position or there is no issue as I am on NRML not MIS . Though I have read the chapters from varsity but I want to know what are the other risk involved other than the Delivery risk on expiry ( If I am not hedging ) & Underlying price movements.

What are the mistakes or blunders a new Future Contract buyer/Seller can make ?

Please guide.