Killed one of the elusive oak trees out on eglin

I went out at 2:30 and sat unti just after 4:00. A small 4 point comes in from behind me and down wind. He is coming out at 20 yrds. I draw back and he hangs up just before the open area. I let down without getting busted. He flicks his tail and starts walking so I draw again and just as I reach full draw he hits the opening. A soft grunt stops him and all is good except I dont fill my flething on my lip. I have on a thin net type face mask that I shot with a few times without any issues. My other two anchor points are fine so I think the mask is stopping me from filling the flething. I send the arrow and cant tell what happened the deer jumped and moved about five feet back into the cover. He looked around for a minute then walked back the way he came. I sat for about an hour then went to check things out. I could not find any sign of arrow or blood. I looked for about thirty minutes then walked back towards my stand looking at trees and found a large cut on one. The cut was very high compared to point of aim. I walked back to my stand and found one fletching on the ground. I must have broke it off letting downloading the first time. I am checking all my flething before my next hunt. Letting a small one get away sucks but if I missed a big one from fletching falling off I would jump head first off my stand. And yes I put them on myself. I always take pictures of things I kill so I will try and post one.