Maybe he was planning to go around and lost it in the power increase?

"Bob Gardner" wrote in
:

An engine failure in a twin is far more hazardous on takeoff than on
approach, because the "good" engine is trying to turn the airplane
upside down and frequently succeeds. On approach, with power reduced,
it is sometimes difficult to even sense that an engine has failed.
Emphasize "sometimes." I have no experience with Swearingens and/or
how power is set on approach. Many turboprops have a negative-torque
sensor that automatically feathers the prop on a failed engine...but
this is a good thing, as Martha Stewart might say...no drag on the
failed engine side, low power(?) on the good engine side. Shouldn't
result in a 90 degree roll.

Bob Gardner

snip