We may never know if CHK had a huge short attack after outlook. Short positions for this week will be on the 2/14 report, published on 2/26. There is plenty of time for them to cover shares before the 14th and no one the wiser.
In a market dominated by High Frequency Computers and Dark liquidity pools it is foolish to write weekly options. I never write them for less than 3-6 months.