This is the place to discuss generalized scanner questions and information for San Diego County. Whether it's radios, antennas, or other general scanner related topics, you can talk about it here.
They were on North Tac-4 long after the medical aid on the police officer was completed. I think since there was an ongoing SWAT that they were staged for any gunfire on additional police officers or suspects. A medic is often staged nearby on SWAT incidents.