Who wins?
Bruce Wayne: He has not been trained, has not become The Dark Knight yet.
Kal-El: There is a Red Star, and is surrounded by Kryptonite.
No weapons. No preparation time. Spontaneous show down.
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Bruce... hasn't been trained? Is he like 5 or something? Regardless, if they both haven't been trained for any specific fighting and they're both as buff as they normally are, it depends on the will of both people. If it's about saving someone's life, Kal's willpower will get him through.