How on Earth would the death of a Governor General mean an end of British rule?
Also how could Bose have killed him with an umbrella? This is not a Bruce Lee movie.
You see if Netaji dared to put umbrella around the neck of Governor General .. he could have gone bit further ...
and Once Governor General had been killed ....all the british who were anyway scared off Netaji would have had fled India and India would have got Independence