Vader is mortally wounded by the Emperor 's lightning in the process .
In agony , Luke calls out to his father for help ; unwilling to let his son die , Vader grabs his former master , and throws him down a reactor shaft to his death .
Vader is mortally wounded by the Emperor 's lightning in the process .
In agony , Luke calls out to his father for help ; unwilling to let his son die , Vader grabs his former master , and throws him down a reactor shaft to his death .