Date- 18 April 2321
Time- 13:56
Location- Card World, Southern Region, Blossom District, Sky Blossom City
The Field Marshal was right any agreement cannot be just annulled by one of the involved parties but needs to be agreed upon by all the involved parties.
Even if it's a creditor forgiving a debt the debtor has the right not to agree to it and pay his debt with the agreed-upon interest rate. People overlook this because they all assume the debtor would be relieved to have his debt forgiven.
Wyatt was fully aware of this when he annulled the wager. Was he betting that the Field Marshal would not agree to it? What do you think? Yes, he was and Field Marshal was fully aware of it. Still, she walked into his trap just like had she willing sat and watched as Henricks stole the D-rank silver beach dungeon relocation card.