…in this video by former emergency responder, he was specifically focusing on preparedness in a family scenario like children. He said the featured technique using car seat headrest was an item available in every car and you can teach kids how to remove (usually you have to push a little button to fully extract the headrest).
I can attest to this — I had to teach my children because in my suv, you had to reposition the headrests to lay the seats flat for extra cargo like bicycles. So this …along with how to push the bendy straw into juice boxes without spilling and making a mess… was something they as pre-schoolers had to demonstrate their grandparents when we all went to a local park together
I have one of those emergency window punches somewhere but have never used it — if it’s like the spring loaded punch for making a dimple in metal conduits, it takes quite a bit of push and control to make it trigger?
Also, in the video, he directed the helper to back up as far as he can before pulling down on top of headrest, so as not to be injured by shattering glass — the helper said he was surprised by how lightly he was hitting the headrest to make the post push down along the window gap, and only a slight downward pressure it took for the window to break, and the explanation was that the headrest post is being used like a lever with fulcrum against the door/window frame.
He was also directed to use the headrest post to clear the remaining shattered glass from the window, and that running the post along the window opening edges makes a quick and mostly clean work of this process.