Play Stage 2-1 solo. Disarm the AI partner and stock her with first aid. Immediately after leaving the warehouse, you will walk between two container stacks and two Majini enemies with crossbows will spawn above you. Kill the Majini that is closer to the crates, and not the ocean. The Majini closer to the ocean is who you will be trying to hit a crossbow shot away. Try and line up with him from your position on the ground, and move a slightly to the left so he becomes slightly off-center from you. If positioned correctly, when he shoots he will be aiming directly at your feet and missing. Once you are positioned correctly, take out your knife and time your swing. Hit his arrow when he fires it. He will need a few seconds before firing again after reloading because he will stare at you.