LAI
re: feather:..
negative torque sensing will drive the prop towards feather, but if positive torque returns (engine relight for example) the prop will return to a thrust position in accordance with engine torque.
now, how much? drag is greatly reduced but not as much as full feather.
this type of ''fixed shaft" turboprop would suffer huge drag if the prop remained in a thrust position and the engine was being driven by the prop...the plane would be uncontrollable...at least at normal speeds.
so, negative torque sensing.
understand the prop is begining to drive the engine and changes the pitch of the prop towards feather.
I wish I could give you a better answer...but think of it this way. IF the engines had been shut down normally, on the ground, the props would be ''on the locks'' and not anywhere near feather.
I think we would know more if the other prop were more visible