Chronus, I took it to mean that, in the sim, the exercise for incapacitation usually stops once the runway is vacated.
As for the comments about clutching the controls tightly, I wouldn't know if a heart attack would cause you to seize or relax but I remember reading about one from the 70s-80s where one of the pilots had a seizure. This caused major control difficulties on final approach as one of his legs seized in the extended position on a rudder pedal. Think it was in Salt Lake City.