The reason power trying give chainsaw to makima because she already know is not possible to defeat makima. But because power feels conform to denji as friends, a lot experience with him, she sacrifice for denji just like denji first devil. And right now denji have contract with 2 devil right?
a bit disappointing that after the clusterfuck that was the last few chapters, it's still going in exactly the way it looked like when power was killed the first time. could have just skipped all of that pointless nonsense