I can't say I've ever faced an 'enemy' in the lists. For that matter, I'm not aware I have any enemies.
I've faced opponents I don't like for one reason or another. Not the same thing.
If I don't know my opponent, I don't give much thought to what he thinks of me. I fight honorably, to the best of my ability, to defeat him. If he proves to be honorable, I cheerfully will talk to him after about the fight.
If I don't like an opponent, I don't care at all what he thinks, of me or anything else. Such an opponent will get my most 'businesslike' fight.
If you're talking about making an opponent percieve you as a superior fighter to them in order to win the mental game, or underestimating you for a similar effect... Well, that would be giving away trade secrets, now wouldn't it.

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Baron Eirik