I get what Jona is saying, actually.
I always understood Mindgames to be the ability to not only read but more to force reactions and put them in positions they don't want. Baiting reactions so you can punish and stuff. Where as tech chasing is really just reading, and that's it. Tech Chases are a form of mind games, it's on thing that falls in that category but kinda sits on it's own at the same time.
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What I said might be more confusing than what Jona said ignore me. I'm not even really a melee player.