I agree with Slashley there. It's most likely only causing trouble when you go over 100%, but for most players this kind of knowledge is better placed to the corner of their mind & not think too much about it. There are too many uncertain factors in it & bad coding can cause "wonders". You either don't use rush at all & be completely safe of the issue or use it with the risk of unknown (but likely nothing notable). In either case, you're probably better off ignoring the "how?" part for less headache.