Just before you fight crush Elora tells you how Ripto arrived. When the fairies are going to scatter the orbs [in Winter Tundra] ,Ripto jumps and grabs a orb however the fairy is going through the door [not the one to fight ripto] but the door is closed. So how did ripto get through the door did the fairy make her and ripto have Ghost mode or did the fairy do somthing we will never find out?