if I may.....having played football for the past 40 years ( I know, I should stop...)....got to take the boot manufacture into account. Go back 20 years and you simply could not bend a boot in two if you pushed the heel and the toe. These days it can be done easily. I tend to think that the boot is bending in tackles and the foot has no choice but to go with it.

Imagine kicking a table leg barefoot and in hiking boots and you'll see the difference.