India can live with flodding.But i doubt your country can go without oil for long!!
Everything China builds in an “incredible time” is bound to collapse, including its economy, but that’s another argument.
If China builds a dam across the TsangPo, India can build a dam across the Brahmaputra to manage the flooding that will cause by the un/intentional collapse of the dam on your side.
Looks like you’re on your way outta here...Zot-time coming up for you chicom.