Board Thread:Questions and Answers/@comment-26440657-20160512111636/@comment-26066818-20160512140156

When his father died, T'Challa took T'Chaka's ring and began wearing it, indicating it was a family treasure or symbol of office as he became king. I think the ring and the arm both contained Vibranium, and that hesitation was both men noticing a "tug" or reaction of some sort between the two objects.