If one chooses to cancel their shield to "revenge", the shield should not cancel if the revenge is not available. Additionally, waiting for someone to "rebuild" and then have something to plunder can take a while. So, they should stay on the menu longer. I do not object to the rule. I just think that being warned about losing your shield if you attack is odd if the game knows that the player can't be attacked. I broke my shield to attack someone, who could not be attacked. It is almost likely paying the coin for pvp, choosing a player to attack and then being told that the player can't be attacked. Losing your shield to revenge is different than losing your shield to possibly revenge.