I played it a little differently I played each round as if it was a 2 phase enemy
Round 1:
Me: Atk: 16+1, Dmg: 8, Win +1 Gold
Round 2:
Me: Atk: 9+1 Tobin: Def: 19+3+2, Dmg: 0
Me: Atk: 4+1 Tobin: Def: 13+3+2, Dmg: 0
Continued…
Me: Atk: 17+1, Dmg: 3 (This decreased Goldleaf health to 2 for this round)
Continued…
Me: Atk: 19+1, Dmg: 2, Win +1 Gold
Update: I found a video on YouTube explaining the combat system. Round 1 you roll to attack, if successful roll for damage, if damage is more than health, win reward. If attack was unsuccessful, roll for defense, take full or partial damage accordingly. Move onto next round and repeat process until all rounds are done. I guess you miss out on the reward if you don’t do enough damage to them in the round.