They're both strong, resilient and good at most sports or challenge they take on. They don't fear competition and they know what they're worth. Once in a while they glance at eachother - wondering when they will stop competing. What if they could start cooperating, how superior wouldn't they be? The problem is that they're too proud. One argue would just trigger an earthquake or push them further away. It's better to just go continue like they've always done, clashing some ideas and gossip from time to time.