One thing to keep in mind if the situation really goes to h*ll - your 5D3 with 70-300L weighs 2 kgs (4.4 pounds), and is on the end of a 3 foot tether. In cave man days, that would have been all you needed to feed the family...or deter a saber tooth tiger.
Totally off topic... I apologize... but I thought I'd share what was until now a forgotten (repressed?) episode in my life. When I was a young man, about 19 or 20, the girl I was dating got abducted. I pretty much went nuts. After about six weeks of me going insane - the police telling me she'd just left me... they quit looking, I got a message from her. She was being held in a house - two blocks from the police station. Both of her captors were gone, and wouldn't be back for an hour. She could not get out - the windows were barred from the inside - totally normal looking from the street. There was one un-barred window - very high, close to the ceiling in the rear bathroom. I stood on a trash can outside and cleared that window with a Nikon F2 with MD-2 motor, and 80-200/4 lens. Totally cleared as in "no glass left". She got on the tub and was able to get an arm out, I was able to grab it, and she got out. We didn't end up staying together long after that, but... over thirty five years later, she's still one of my closest friends, and we see each other several times a year.
Cameras can be handy.
Fascinating story, did the cops get those responsible?