Theo, having departed from the bridge and its guardian, suddenly remembers that he left Tansy's unique telephone-brooch in his jacket pocket. Despite this realization, he has no intentions of returning for it. To him, the brooch symbolizes an unwelcome burden, and he's content to let it incur unwanted charges for Tansy.
His reflections lead him to feelings of resentment, suggesting that he perceives Tansy as a betrayer, hinting at a deeper rivalry or conflict. The mention of "Revenge of Vilmos" indicates a potential for payback, underlining his frustrations and thoughts of retaliation.