Well, it’s the Zombie apocalypse… It’s probably a bad idea anyway to drive at 100 km/h (~70 mph) over the (non existent) highway. Unless you cleared and secured it, of course (which would makes this discussion pointless).
There will always be something “wrong”, whatever we go with. As it was posted in the mentioned other thread, “the timing might be right, but the distance traveled is wrong”.
However, I also agree that you can’t assume 1 tile = 1 sqm, unless the walls in New England are really 1 meter thick and people take swings at each other while one meter apart (thinking of which, that Zombie horde is really spaced out well, isn’t it?).
Also, our (re-/)actions are done in milli- or even microseconds. We don’t have that precision in the game. So, from my point of view (and keeping in mind that it’s a game), I’m totally fine assuming that our character actually started breaking much earlier.