The trigger is made to reduce the current bet size so that its liability does not exceed max_liab.
The constant max_liab is a percentage of the starting bank. You can check the current maximum liability that the trigger will be adjusting the bets to. Just open the variables window and enter the following expression:
max_liab*starting_bank/100
This will be the maximum liability for your bet. The trigger will not stop betting (there was nothing about the need to stop in the trigger description), it will reduce the liability.