The guys that work "Up North" are notorious for stuff like this. Most of them carry sidearms. (Big arse revolvers)
They may look nonchalant but they know exactly what they're doing. That's not a big croc but he'd mess you up.
True story...
Some years ago "they" were preparing for a Presidential visit of Bill Clinton in Darwin, Northern Territory. A team of US Secret Service guys used scuba gear to dive into a river near the convention centre as part of the preparations. (security checks for explosives etc.) That river was infested with crocodiles. The Secret Service team was told about the crocs but they didn't hesitate. They geared up and jumped right in. I wonder if that's in their job description somewhere.
BTW: Bill Clinton has made many trips to Adelaide, South Australia because R.M. Williams make custom boots for him.