Earlier quoted context omitted.
It's Australia mate. They don't have much in the way of gun ownership. Once a group of children were massacred there, see the 1996 Port Author massacre for reference, they collectively decided that gun control was needed. I doubt it would even occur to most Australians to kill anything with a firearm. Your reaction freaks me out actually.
Would you have felt more comfortable if he had just said "euthanize?" I've never really understood the aversion to particular methods of killing felt by some people. Dead is dead. As long as something doesn't cause undue suffering, does it really make a difference if you shoot, stab, or gas the tortoise?
Furthermore, getting shot is not a guarantee of death. The poor turtle could have been badly burned AND shot and still not dead.
So yes, still freaked out by that comment.