When a raptor pins you. You can do nothing and no weapon works.
EXCEPT..... Metal/stone Hatchet. Even though it doesn't show any hitting animation. You will see that while pinned downed You can cause damage to it through a hatchet.(MOBILE TRIED). Up If Anyone Does Experiment. Good luck. Try it.
Always have a bola on you so if you see it you can trap it n kill or tame. Or have some strong weapon like an ascendant sword or anything to kill it fast... BEWARE!! cause if it comes too close, it will pounce at you and pin you to the ground. Then all you can do is “absolutely nothing” except watch it eat you to death! Good luck! Also, always expect there to be more than 1 raptor. Play it safe!