Mist Hide is a move learnt by Rapp which allows him to teleport to another spot on the battlefield instantly. It is a good move to quickly use if Rapp is about to be attacked. However, it can be unreliable since it doesn't specify where he is teleported, which can be a liability in boss battles against enemies with straight line attacks. It also generally doesn't need to be used much since it may be faster to attack the enemy to cancel its move. Mist Hide also has the additional effect of increasing Rapp's evasion upon use, though the game's description doesn't specify this.
It costs 5 SP and is one of Rapp's inital skill moves. It can be used with any weapon equipped.