What Rights Would a CCW(H) Bystander Have to Intervene in the Cincinnati Gorilla Situation?

Could a bystander licensed to carry a concealed handgun be (theoretically) within his/her rights to intervene in a situation like this? Aside for the obvious anticipated media storm and anticipated legal backlash - could such an individual climb into the enclosure with the gorilla/child and shoot to kill?I don't have massive balls (or a big handgun), so this wouldn't be me.Video sauce: https://www.youtube.com/watch?v=Zfuz7cTDNeI via /r/CCW http://ift.tt/1Wy489A