Once the Titan super is activated, you need a headshot and shields weakened to kill them with golden gun. Titans like myself know very well that without the invincibility super perk active, we can survive. It's hunters stupid map awareness which suffers greatly because they walked forward into that situation... I rarely have any issue with golden gun killing titans because I'm never close enough to get killed by them. Ironically, I also kill a boatload of hunters because golden is active when I'm close quarters with them... Battlefield awareness people. Saves your life and puts the other player on the respawn screen.