There are several reasons for sending fire units.
First, many paramedic units are staffed at BLS levels and require a driver from a different unit if they need to make an Advanced Life Support transport.
Second, fire department resources may be closer, so they can get first responders on scene more quickly. Most fire departments require all firefighter to be at least EMTs, and many departments are all paramedic.
I don’t know the protocol in the area, but in Milwaukee, the fire department is dispatched to provide EMS care, then a private ambulance is called for transport unless the patient needs advanced life support transport. This is a common protocol in larger cities.
Finally, in many cases (not this one), when a person has fallen, the fire department will be needed to force entry into the house.
PS: If it’s a US senator send everybody.