Bolt'n Boots

Attack Reaction -

, destroy this: Target arrow attack with

greater than its base gets go again.

Battleworn

Rulings

From the Compendium of Rathe release notes

When activating Bolt’n Boots activated ability, you must target an arrow attack that currently has greater than its base. When the activated ability resolves, if that targeted arrow attack still has greater than its base, then it will get go again. If it does not, it will not get go again.

Keyword notes

Battleworn - Equipment that wear down after each time they are used to defend. If you defend with a card with Battleworn, put a -1{d} counter on 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.
A -1 counter stays on the card until the card is destroyed or the game ends.
If the defense of a card that is defending is below zero, its defense value is considered to be zero.
When this card is destroyed, it is sent to your graveyard. (Not when it has 0)
When this card is destroyed, it is sent to your graveyard.
If the defense of a card that is defending is below zero, calculate as if its defense is zero.