Why does immune response to coronavirus save some, kill others?

Doctors in Southern California are working with researchers in Arizona to better understand the body’s sometimes bizarre immune response to COVID-19 — an antibody onslaught that may kill the patient, rather than kill the virus.
The nonprofit Translational Genomics Research Institute (TGen), an affiliate of City of Hope, is peering into specific proteins on the virus to see how they react with different antibodies — a “high-resolution view” that might guide treatment