Last I checked, no one is a felon until so adjudicated by a court of competent jurisdiction.
Parent comment appears to have in mind either reasonable suspicion or probable cause to believe a felony was committed. So not identical at all — nor clear.
Also questionable whether any commands were lawful.
No it's not. See the most recent NY Times article where they analyze the shooting from every available angle, and it's clear Agent Ross was not in danger, and was not hit by Good's vehicle. His phone he was recording with hit the front of the car as he was preparing to fire his weapon.