An Australian acting police sergeant from Victoria has been suspended after footage emerged on social media showing a civilian being thrown head-first into the ground by an officer. The footage, which began circulating on Sept. 22, shows a male speaking to three uniformed police officers at Melbourne’s Flinders Street Station, in what appeared to be a calm conversation. Then, a fourth police officer can be seen walking up behind him, before grabbing him around the torso, and then throwing him (in a “sling tackle”) to the ground face-first. An audible sound could be heard as the man’s head hits the floor. The man was motionless afterwards. The person who filmed the incident claimed he was unconscious, according to News.com.au on Sept. 23. “This poor guy was calm, he was just talking to the police, you can see it in the video then he gets thrown to the ground,” the witness said. “You …