Prey’s "Help Luther Glass" optional objective begins soon after the arrival of Walther Dahl during "Before I Give You The Key." You’ll get a TranScribe call from Luther Glass (We got the call while deactivating Morgan’s tracking bracelet as part of "Ghosting Dahl.") He’s wounded and holed up in the Trauma Center in the Talos 1 Lobby.
Meet Luther Glass
Luther is in the Trauma Center on the second level of the Talos 1 Lobby — you’ve probably been in here before either just exploring some optional rooms or during "The Corpse Vanishes." In fact, wasn’t Luther Glass the name of the corpse on the gurney in the Trauma Center?
If there are still turrets in or around the Trauma Center from the first time you visited, now would be a good time to redeploy them.
Survive Dahl’s Operator ambush
Luther’s call was a trick to get you cornered in the Trauma Center. Several of Dahl’s operators will attack you when you get close to Glass’ body. All you have to do is survive.
EMP charges and your GLOO cannon will incapacitate them. Hacking and machine mind will make them friendly. Bullets and your Disruptor stun gun will make them stop shooting you with lasers.