After the sentences

Any Clansman apart from the Clan Lord who announced it may step forward to fight in that Duel by posting a comment to it, stating such an intention, and listing the Items they are taking to the fight. The Clansman must be holding any items they wish to take to the fight.

Add the sentence

A Clansman who has stated an intention to fight but hasn’t started the Duel may post a second comment to the blog entry stating that they withdraw. After this, they are no longer considered to be a Duel’s Combatant for that particular Duel

Add the tradition

The Fallen Lesser God Tzasix has proclaimed that no Clansman may withdraw their intention to fight until 72 hours have passed since they first decided to fight.

I decided to make this proposal because it would be annoying for a duel to start a month after you agreed to it.