DO NOT USE THAT ARROW
A crack or blemish in a carbon arrow can cause it to explode when you shoot it.
When that happens, you could end up with parts of a carbon shaft in your arm or hand.
My brother is new the bow hunting and when he showed me his new bow and arrows, I noticed one that had a 1/4 in split at the nock. He just glued the nock in and thought it would be ok.
I told him the same thing - Don't shoot it. Once carbon is fractured or blemished, it is no longer any good.