The man in the video — identified by Australian press as Greig Tonkins — was part of a hunting trip in June for a now-deceased friend Kailem, who was suffering from cancer and wanted to go on a boar-hunting trip with his buddies.
After hearing about Kailem's condition, friend Mathew Amor organized the group hunting trip at his New South Wales property — which eventually led to a run-in with the "roo."
Amor said it was out of character for Tonkins — who is a zookeeper at Taronga's Western Plains Zoo in Dubbo — to strike the animal, explaining:
"My mate has a good government job, so he's gone pretty quiet on this… We were driving along, the dogs are loose. They are trained to smell pig's blood, and picked up a scent. The dogs went past 20 kangaroos, which they are trained not to touch."
After a particularly "big buck" got a hold of one of the friends dogs, Tonkins snapped into action and "stood his ground" before sucker-punching the roo right in the snout.