It wasn't just the assault on the nurse, it was the fact that he interfered with patient care of all of the patients in the department at the time. Every one of those patients could legitimately sue him, his supervisor, and the SLPD for that.
Got it - but a logical application of this statement assumes that the 20 minute ordeal resulted in patient-care coming to a halt. That would be an overstatement and imply that patient-care also could not sustain its intended quality without that specific nurse present. This point is an over-simplification at best and unless any tangible evidence is produced I doubt it will be held upheld by a judicial authority.
A safe assumption is that the nurse has probably taken a shit longer than she was held in custody.
I understand the principle of the situation in the hospital in regards to patient care, but question if anyone has observed the principle of this man's service while weighing the cause/effect and trade value of firing him AWA demoting the Lieutenant. The irony is our collective demand for a realistic and sympathetic approach from the detective yet refusing to apply that mentality in a decision that will impact his entire life.