Snipe him in the face, thorn him in the face, Last Word him in the face, Hawkmoon him in the face, (insert really any primary here) him in the face. Or you could dodge the bullets with blink, but titans have the "best jump in the game"so they are the best at this (sarcasm). Gunslinger hunters get no shield and are easy to kill. Plus, its easy to miss with a golden gun when you are being shot. Pretty easy to counter. Same as BD, shotgun and then melee.