When does Blitz reduce the cost of a Fast Power and when does Blitz refund Energy for a Power being Fast?

When does Blitz reduce the cost of a Fast Power and when does Blitz refund Energy for a Power being Fast?

When you play Power Cards by paying their costs {1}, total up the Energy cost of all of the Powers you’re playing and reduce it by 1 per Fast Power to determine how much you need to pay. If that number is negative, gain that much Energy as a refund.
When using a Fast Innate Power that has the potential to do something for the first time each turn, gain 1 Energy as a refund.
When you make a Slow Power Fast (via Swiftness of Lightning or similar) gain a 1 Energy rebate.
If a Fast Power Card (or a Power Card made Fast) costs 1 or more Energy, also reduce its printed cost by 1 (e.g., for Repeating it with Gift of Strength or checking when it's played by Rhythmic Power Builds to a Cataclysmic Crescendo).
{1} = This usually as part of the “Play and Pay For Power Cards” action in Spirit Phase, but sometimes a Power like Call on Midnight’s Dream tells you to do so.