Why can't Q draw a circle?

Look at the original text and you will know:

So a long-sleeved figure took a piece of paper and sent a pen to Ah Q in his hand. Ah Q was shocked at this moment, almost "stunned": because his hand is related to the pen, this is the first time. He doesn't know how to accept it; The man pointed to a place to teach him.

Draw flowers.

"I ... I ... don't understand." Ah Q grabbed the pen and said with fear and shame.

"So, it's cheap, draw a circle!"

Ah Q wants to draw a circle, but his hand holding the pen is just shaking. So the man spread the paper on the ground for him, and Ah Q fell down and drew a circle with all his strength. Afraid of being laughed at, he decided to draw a circle, but the hateful pen was not only heavy but also disobedient. I almost closed it with a shake, but I shrugged my shoulders and painted it like a melon seed.