That does seem like the most obvious explanation

Morris: “I hear ambulance! Maybe somebody hurt!”
Milo, showing his clenched fist: “Maybe someone has a hole in them THIS big.”
Me: “How would they get a hole that big in them?”
Milo: “Maybe there was a monster with huge claws and it just went ‘HAAAA!” (stabs imaginary victim) “… and the person went ‘Aaaaagh, I need an ambulance.'”
Me: “Well, that does seem like the likeliest option.”