An ablation system observes and monitors ablation parameters, including temperature, impedance, and/or the system's own closed-loop response to these ablation parameters in delivery of power to one or more ablation electrodes, including cessation of power delivery to one or more electrodes while maintaining power delivery to one or more other electrodes. The system comprises a catheter with one or more electrodes and a detection circuitry configured to detect an ablation parameter for each electrode, a controller coupled to the catheter, the controller having a processing unit and a memory storing instructions that, when executed by the processing unit, cause the processing unit to: receive a detected ablation parameter for each electrode from the detection circuitry, control a power supplied to each violating electrode to have a reduced power when the respective detected ablation parameter violates a defined ablation parameter, detect a rate of power reduction for each violating electrode, and stop the power supplied to each violating electrode when a respective detected rate of power reduction exceeds a threshold rate of power reduction.
