He's not even doing very much in this scene, it's not a big emotive scene, but so much comes through. As a performer, Williams was like a clear pane of glass to his soul.
His stand up comedy and comedic performances were often noted as being propelled by nervous energy. It always seemed like Williams was trying to outrun something. It was a race that required him to be sensitive, knowledgeable, intelligent, and coherent. We saw brilliance when we saw him succeed at this.
Twitter Sonnet #655
Hairless hat creatures dance for chequered flags.
Knowledge leaking through black fountains recursed.
Erroneous donkeys ate their name tags.
For his tail Curious was reimbursed.
A bag of weasels defaced Piggy's moon.
Sharknadoes can't end the eternal war.
Beelzebub's men besieged Brigadoon.
Innocent Hurricane beat the cell door.
Five beats ahead of the egg was air pure.
Now fashionable patterns were floors then.
A twisted cable in a gut's unsure.
A diary awaits the cocaine pen.
Tubes of salt hold some fry matter inside.
Sea-less crowns came with the black luckless tide.