Diminishing returns pvp

How does it work exactly?
When I cheap, gouge, kidney, blind, sap all with full durations then cheap shot again that cheap shot is getting diminishing return? How?
It is like the diminish return cooldown is 20 seconds and that the second cheap shot is on same category as the first kidney shot but the first kidney shot is not on same category as the first cheap shot cause the first kidney gets its full 6 sec duration. Makes no sense to me I have to be missing something lol
When I cheap, gouge, kidney, blind, sap all with full durations then cheap shot again that cheap shot is getting diminishing return? How?
It is like the diminish return cooldown is 20 seconds and that the second cheap shot is on same category as the first kidney shot but the first kidney shot is not on same category as the first cheap shot cause the first kidney gets its full 6 sec duration. Makes no sense to me I have to be missing something lol