In chinese old saying, "mercy to your opponets is mean to yourself" Learn the lesson through your life. This lesson apply true in all aspect of live.
Before you said Kollos is treacherous. Did he reply you in written fromat that he will leave the airfield and accept your "merciness"? If no, how can you said he "eat your word" in case he didn't "eat anything?
For me, except in very rare situation I will allow my opponent fly back home
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Let me assume a situation, did you see "saving private ryan"? Hanks let go the german soldier that shoot down his medic, and that German return him fire in the last screen. If I were hanks, even though I will forgive him, I will shoot his arms or somewhere else to not allow him to return to battle field again.
Hope it may sooths your sense in someway.
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Next time in the battle field, don't be so "friend" to your enemy.
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