Hi!, I don´t know if you already got the CG unlocked, but if not, I believe it´s because there´s 4 ways of getting the same CG.
The 1st and 2nd way would be: attacking him without the pencil when choosing ´attempt to get free´ and then missing the timed choice (beg for forgiveness), get the CG, scroll back to the timed choice or load and repeat but this time clicking on it (beg for forgiveness) on time.
The 3rd and 4th: attacking him after choosing the ´do nothing´ option, then missing the timed choice (beg for forgiveness), get the CG, scroll back to the timed choice or load and repeat but this time clicking on it (beg for forgiveness) on time.