Sid,
WARNING - 100% conjecture.
Oops - my bad - normal here!
Engine Overspeed AEO at or about equivalent 30 sec power OEI. ~ .78 - 82 FLI depending………..
Needle split - not quite enough power to cause N2/Nr to go into overspeed function- N2 is what triggers Overspeed protection.
Looking at instrumentation - which one is really the duffer?