Hello! I had contemplated a tourney aspect but hadn't gotten very far yet. Best thought I had so far are linked clocks-- one for each player/horse and a rival/representative of the other competitors. Fill player clocks as established, and fill linked rival clocks as consequences and devil's bargains. Cutting between players and their chosen activity (jousting, jumping, barrel racing??, dressage?, cross-country) will keep the tension high.
Viewing post in Search for the Demon Horse [FITD, Steed & Steel] comments
Sounds like a teammate assistance action for 1 stress!
From Blades:
"You can normally get two bonus dice for your action roll (some special abilities might give you additional bonus dice).
For one bonus die, you can get assistance from a teammate. They take 1 stress, say how they help you, and give you +1d. See Teamwork, page 134."