Axe Wielding Guard

We are camping this weekend in Perth and CyclopsJnr has found a herd of like minded children to run with.  They have formed a gang, complete with gang nicknames and a secret password to enter the woodland den.  When I went to check he was doing OK, I found him in the park on guard duty with an axe (rock attached to stick with elastic bands)...

I'm sure it's all fine.