Guernsey Police say the violent incident occurred around 15:30 outside the pub on 3 August and involved several unidentified individuals.
It said a video of the incident is currently circulating on social media and have request anyone with a copy to get in touch withauthorities.
If you have any information regarding this incident or have access to this video, you are asked to contact PC 74 Sheppard, PC 37 Wright or the Duty Sergeant on 222 222 or Crimestoppers anonymously on 0800 555 111.