Brute Force
First off is the brute force approach. As the name for this suggests, it’s all about letting your guns to do the talking before Sinjin can even get a word out. There are two different methods of doing this, though. First, if you’re playing on one of the lower difficulty levels, you may be able to use a high powered, scoped rifle and pop his head right off. We’d suggest using Jet to allow you to perfectly line up your shot, but that’s up to you. Using V.A.T.S’ critical hit option, if you’ve got one saved up, is a pretty useful way of taking Sinjin out of the equation quickly.
Alternatively, you could go for the close-range option. Here, you’ll want to equip your most powerful shotgun, something like the Combat Shotgun will do the trick. Exit the elevator and let Sinjin talk. Keep walking forward until he tells you not to take another step forward. If you’ve got it, use some Psyho Jet to up your damage, damage resistance, action points and to also slow time. Unload your shotgun right into Sinjin’s head, and a couple to Avery stood next to him. Throw a grenade at the other two nearby raiders, but make sure they’ve not already began to charge at you, otherwise you risk blowing up Kent in the explosion.