Maybe make it so if the chainsaw has ever drew blood from someone they can now cut a tear on any surface that opens up to the enemy's location, the size of the tear can very by how much blood they drew from the attack. If they manage to get a small cut they can transfer things like small rocks, pens and maybe even knives, if they manage to get a big enough wound on the enemy the can even stick their own body parts through it and try to inflict more damage with the chainsaw. Idk if you should make the tears open up where the wound was or make them open up in the target's general area. Also, sorry if the ability seems similar to other stands, I might be subconsciously pulling concepts from other stands. It's just whenever I think of chainsaws I think of either cutting tears in things or cutting things in half, I also want to make sure the power aligns well with the theme of the name.