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eastwatch ... you should read more about this "Siliguri Corridor" or the "Chickens Neck" area of India b4 dreaming up scenarios about India getting humiliated.
This corridor is one of the most fortified places in India as equal to LoC if not more. The Eastern Command of IA, based in Kolkatta,WB, is one of the largest where its basic role is more of defense than offense.
If the need be India will move into the sovereign territory of BD to counter any Chinese thrust from the north, because this corridor is too crucial to be lost. In case of a war with China, BD wont be able to turn against India or even remain neutral. You wouldn't want to loose half of north of BD by turning enemy to India.