T'Challa with the bullshyt loophole in the rules....
Never mind that Zuri interfered and Killmonger obliged his request to be sacrificed, but Killmonger game T'Challa an chance to fight back while taunting him, Killmonger even tossed his weapon to the side to even make it more fair, but T'Challa was then lost with rage because Killmonger killed his father's betrayer. But again never mind all that. Dude was as good as DEAD had it not been M'Baku finding the body, Nakia stealing the herb which was originally was for M'Baku, and them reviving him. OF COURSE HE DIDN'T YIELD.... he was pretty much DOA, barely living, only the ice & snow to preserve a heartbeat and had to give him magic steroid juice to resurrect him while he was ALREADY in the ancestral plane with T'Chaka welcoming him in open arms.
Now talking about "I didn't yield".... and forced a Civil War due to that bullshyt loophole