Hi
Selection index 8, in Half Time/Full Time market, is Team B / Draw like you said in your initial post
In the example trigger, the condition is checking the prices of the selection required according to the Constant team_index
if the constant is 1 the trigger executes (checks the prices) on index 1 Team A, if the constant is not 1 the trigger executes (checks the prices) on index 9 Team B