I really need help!!

I'm trying to get Rathalos Blade "Blood" but I cant get 1 stupid rathalos wing!! Can somone please tell me how i should aim to get a wing? I'v killed this thing about 10 times. I'm in Hr3 trying to get it. I'v even tryed going after them both, (Rathian, Rathalos), but its just not working. I have full rathian and full rathalos. IDK what to do now. Pluse, why would it be so hard to get a wing? I mean he freacken kills it... Btw, how do you capture somthing? I always end up killing the thing...XD

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