Look at the video...he chalks, then slides the cue across the cloth and chalks again. How can you argue that it wasn't intentional? I would say ok...leave your cue at your chair and only come get it when you are ready to shoot...Or I would confiscate his chalk and only let him chalk up when he's ready to shoot.
This is so dumb.
Can you show a mark?
No?
Then sit down.