Haas can be heard calling Kelly a f***ing c***, while also holding his hand to his throat and appearing to deliver a left-handed punch to Kelly's head.
It is unclear when the video was taken, with Kelly not appearing to show signs of the foot injury he suffered in Saturday's loss to the Warriors.
The 22-year-old was last year handed a good behaviour bond over an altercation with police in Tweed Heads, where he was accused of intimidating a female officer.