Bring a Mella on-camera while moonwalking, to set it up to move upward at the maximum rate (about 4 pixels per swoop). Guide it to a horizontal position inside the left wall below the Power Bomb blocks. When it is high enough, freeze it as it retreats from a near-vertical swoop. Get into position on the ledge below the Power Bomb blocks and wait for the Mella to thaw. Freeze the it inside the wall as it continues its retreat upward, by jumping and firing a downward shot. Run into the wall to clip into it. Crouch and destroy the Mella by shooting up (by holding angle up and angle down) Then X-Ray climb above the Power Bomb blocks.