FS flameout may be more realistic, but you need to test for worst case scenarios. Having F5 throttle down allows any kind of Dragon acceleration to pull it away

FS flameout may be more realistic, but you need to test for worst case scenarios. Having F5 throttle down allows any kind of Dragon acceleration to pull it away from the Falcon. The critical design element of an crew ejection system is that it needs to out-accelerate the rocket so testing while the Falcon remained at full power seems logical. They probably have reasons not to do it.