For one Herriman cant THINK fast enough to phase exactly as he was struck, for two you didn't specify at which point in a leap. Mifune leaped twice the first time closing the second time dodging anyway. For a third point being able to phase out of the realm is fine but teleporting directly behind someone who already struck you is OP and GMing a little bit. Also Mifune is a werewolf and has been fighting since the Edo period and Herriman is a berserker so Herriman would be heard the minute the axe began to move there is no such thing as a slient swing.