I used the Nockturnal Shift Nock on this mature 8 pt at the 11th hour on 30 January after Blizzard 2022. He came out at first light and offered me a 20 yd broadside shot. The arrow went through the vitals and stuck in the opposite side shoulder. He ran off with my arrow through the woods. The red/green strobing light looked like a firefly following the deer. Very easy to see in the woods. The buck threw the arrow 20 yds from where he piled up. It landed straight vertical. Easy to find arrow and buck. I love the easy, although tight, shutoff switch on the nocks. I recommend them to everyone.