Does Esbern's Potion from the Dragon Research quest always glitch. I read that it won't give you the Dragon Infusion ability when you drink it, but I don't know at what point it will glitch or if it works fine sometimes. I need to get the Dragon Elder Scroll, but if i do that quest then I have to kill Paarthurnax, or else Esbern won't speak to me. Could I just obtain the potion and not drink it until this is fixed, or will Esbern still not talk to me after I drink the potion?