Well I only ever had one real engine failure during flight and any idea that you might 'zoom' climb after the failure whilst the speed drifted back would have been a joke. It was a catastrophic failure of the compressor and happened so quickly that the yaw, when corrected, had the airspeed back at 70kts and by the time the vital actions and a Mayday had gone out the IAS was stabilising at around 50kts.
Seen many fine demonstrations of the 'zoom' climb but in reality you may not have that opportunity.