So, little bit late to the party.
Years ago when my cousins were still little they of course had dogs, and play turned into mauling one of them whilst i was on parental watch as a new teen. Since I was a drive in see twice a year kind of guy, the dog didn't recognise the usual tones and commands to back off and play nice.
So I ran up and punched it in the side of the head, hurt me more since dogs have hard skulls.
So, dog lets go of my cousin, looks at me since I just punched it, and first thoughts in my head was that now I was going to be royally screwed because dogs in a means to go someone, so I headlock it and effectively mount it so that it can't really do anything but calm down. Said cousin who just had his dog go him, walked up to said dog, tears in his eyes and a little bit bloody, and smacked it on the nose, whilst I sternly told him to piss off inside his house. Did I want to punch said dog? Nope, did I set out to do so? Nope, did the dog deserve it? Nope. But you really don't think about those things when you're in that moment where you have to make a choice, the only thing going in your mind is how to stop whatever said animal is doing to something you give a s**t about, so that it does not do it again.
I have family that would do that to an animal going their dog, just as I have family who would see it happening, crack a tinny, a deck chair and laugh heartily at the spectacle.
So did the bloke have to punch the roo? Probably not, but the roo did just go his dog, and at his approach to diffuse the situation rear up to make himself look bigger to either launch at him or dissuade him from approaching through intimidation. This isn't a roo in suburbia lost and looking for a way back to the bush and safety, this is a roo, in the bush (judging from the surroundings) in its native habitat, I mean sure I would not have, but as above it's a split second decision you make, you hesitate and s**t can get real, really bloody quickly.
Please, he'll tackle a platypus, wrestle for a bit and then cop a barb for his trouble whilst the wallaby's chortle.
To be honest its the filming it and becoming an internet big shot because of it i really object to.
Not every s**t that happens belongs on youtube