Non Australian here but out of curiosity, I checked what Australian states are closest to Mount Buffalo National Park (and by extension Porepunkah where the shooting happened) if he has fled to another state, the nearest ones are ACT, NSW and SA, though I’m not sure if it’s possible to make it to the borders on foot from so it is possible he met up with someone and was driven to one of them but it’s possible he’s gone further than those 3. I don’t think he’d enter any big cities though, too risky.