If you haven’t seen “Avengers: Endgame” yet, don’t worry. There are no spoilers here, other than to say it will put you in a mood that lingers with you. Naturally, given the title, you’ll think about endings and how they happen, when they should happen, why they have to happen and if they really happen at all. It’s an internal dialogue that for most of us is no more than existential musing, but for professional fighters, it’s necessary and practical. No one can fight forever…
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