Flash of Brilliance

When this defends, you may discard a Lightning card. If you do, return an aura you control to its owner's hand.

Blade Break

Rulings

From the Rosetta + 1st Strike release notes

You choose whether to discard a Lightning card, and what aura to return to hand when the trigger resolves.
There is no priority between choosing to discard a Lightning card and returning an aura to hand.
If the non-token aura you control is owned by an opponent, it’s returned to their hand, not yours .
If a token aura is returned to hand it ceases to exist instead.

Keyword notes

Bladebreak - Equipment that are fragile and break after being used to defend. If you defend with a card with Blade Break, destroy it when the combat chain closes.

When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same combat chain.
When this card is destroyed, it is sent to your graveyard.
The ability becomes a layer on the chain when the combat chain closes.
The Blade Break ability becomes a layer on the chain when the combat chain closes.
The ability goes on the stack when the combat chain closes.

All keywords

TalentLightning

TypeEquipment

SubtypesHead

Defense1

KeywordsBlade Break

SetsAUA, LGS, OSC, ROS