>>327534https://www.youtube.com/watch?v=tzEAp32rntQYou get the idea. I know a guy who had it happen to him, they almost had to amputate his thumb, it fucked up his nerves, tendons and muscles. He either feels nothing in his thumb or some days he has excrutiating pain, either way he has no control over it and now has to wear a special glove that's reinforced in the thumb so he can grip the bow.
It's not just carbon arrows though, same can happen with aluminium and wood.
Carbon = Porcupine
Aluminium = Peephole
Wood = Depending on species it's a combination of both.