Parachutes next to a window with a hammer. Would have helped some, but of course you could not store enough for everyone. And whilst training may usually be nec

Parachutes next to a window with a hammer. Would have helped some, but of course you could not store enough for everyone. And whilst training may usually be necessary, shoulder and leg straps aren't that hard to work out and a bright coloured mini chute thrown to engage the main chute would be feasible. And of course the perils of crashing into the building etc are still there but for the sort of situations we are talking about you would be almost certainly dead if yiu didn't jump.