I think the scene had far less story relevance than that, JKDS. My read is it was a world building scene-- Similar to us seeing Pycell getting all limber and doing stretches that defy the age he portrays, or Jaqen Hagar revealing that the face we'd come to love is not his face at all. Both of those had some story implications, but more than anything they helped to make Planetos an even more curious world.