How to shorten how long an ability is active

How can I decrease the amount of time, Wrecking Balls shield is active. Currently it’s 10 seconds, and I would like to make it last 3. This is so he is able to use it every 3 seconds, and doesn’t have to wait 10 seconds for the ability to end.

As far as I’m aware you can’t actually shorten an ability
BUT you can recreate it

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