LeGenD
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HGV can be Scramjet-driven and conventional.Actually, the dichotomy is scramjet vs hypersonic glide vehicle. The glide vehicle doesn't have an engine.
If something like Glide Breaker is so super secret, then it will be a long time before India gets its hands on it. And even if it does, the mere collision of two hypersonic bodies will create such a debris cloud, it will be lethal on its own accord. If the incoming missile creates a fuel air or thermobaric mixture, then the counter punch will create even bigger problems. It is a lose-lose proposition when viewed as a fundamental physical problem.
Examples: https://en.wikipedia.org/wiki/Boeing_X-51_Waverider
Too many prototypes of differing characteristics.
Of-course, the defenses which I pointed out are not in Indian hands - and will not be anytime soon (hopefully). Also, defenses are just a part of the equation. Offense, in itself, is important.