This is not the first time this particular street performer has been attacked. There's another vid out there of him smacking some annoying prick in the gob.
Right after this video was taken this douchebag and his 5 friends took off laughing and joking about it for about 10 minutes until this video was shown to police and he was located then slammed into the concrete by 4 coppers, handcuffed and arrested by the Queensland Police. Assault charges along with 7 other charges were laid so a somewhat satisfying end to the story.
If description is true, asshole got what he deserved.
I must admit though I'm curious if a mime were punched in the face would it make fists under its eyes and look sad or break character and actually fight back. Hmmz