I just realized something very interesting about Sion we all overlooked.
When Sion ults away and screams "COWAAAAARDS," he's not being ironic. He's insulting the enemy team for not going as balls-deep as him to use such an important cooldown in a random direction.
Either that or he's trying to catch the Gromp frog but keeps losing it, and he's yelling at it to come out and die.