LOL. No he didn't. T'challa never yielded and Zuri (Forest Whitaker) interfered in the combat, which is essentially a DQ. He did it due to feeling guilty seeing the results of his actions or rather inactions of aiding in T'Chaka's cover up for N'Jobu's kill, thus creating Killmonger.
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Lot of ya'll getting so wrapped up in Killmonger's militant, thuggery (albeit he had some solid points for sure, so I understand why) that ya'll missed out on the subtleties that took place. Like T'Challa literally could have killed Killmonger very quickly, early in the battle, as twice that he had deathblow shots that he didn't miss by accident, but by intentional mercy. T'Challa relented in their first fight due to a. just finding out the history of Killmonger's upbringing and feeling much remorse for his father's cold-blooded actions and b. taking upon the higher road of Wakandan principles in not killing unless absolutely necessary. Sure, it was quite the gamble for him to do so and plenty would say was the wrong play to make, understandably so.
