  We study computationally the collision dynamics of vortices in a
two-dimensional spin-2 Bose-Einstein condensate. In contrast to Abelian vortex
pairs, which annihilate or pass through each other, we observe non-Abelian
vortex pairs to undergo rungihilation - an event that converts the colliding
vortices into a rung vortex. The resulting rung defect subsequently decays to
another pair of non-Abelian vortices of different type, accompanied by a
magnetization reversal.
