The Hospital
Turn around and grab the Revolver Ammo x3 off the man you just killed and then hop through the window on the right and hug the wall that faces the counter. When the guards check the body of Ethan, one guard will head off down a hall and the other will check the window by the counter. When he turns back away from the door, pop out and grab him by the counter. Now when his buddy come to investigate, jump out the window you came through originally and circle around and get him while he check on his friend, This strategy can be used for the following two guards that follow from the distant halls, but with the office on the other side of the bodies.
Hop through the window across from Ethan's body and grab the 1/4 Blades and 1/2 Alcohol from the table and exit the window on the other side to find 3/4 Binding on a gurney. Now return to Ethan's body and enter the second room on the left and search the bathroom for 3/4 Rag and then head to the lab across the hall and grab the Supplement x5 from the table and 1/4 Blades from a counter.
As you jump into the brightly lit area, two guards will approach from the right and a static guard will be straight ahead and a little to the right. Jump back into the lab and wait for the two men to split up and take out the nearest one that heads off to the right while the other investigates the area over by the static guard. Hop back into the lab and wait for the other guy to head through the room and then turn right to check on his friend and follow him to strangle him too.
To the right in the open area is 1/2 Blades, Sugar, and a Health Can, while the small office next to the static guards has 1/2 Alcohol, 1/4 Blades, and 1/2 Binding. The two static guards are in your way, but you can get them to move by causing a distraction with a brick/bottle or even shoot an arrow. Once they stop looking in your direction, shoot them with the bow headshot or sneak up and strangle them.
The room to the left of the West Wing has a 1/4 Explosive that you should grab and then head down the hall and hide behind the receptionist desk and let the three Fireflies pass by. Grab the 3/4 Alcohol and 1/2 Explosive and then walk toward the exit.
As you enter a Firefly will bust through the door on the other side and begin to fire. Either take cover or throw a brick/bottle to stun him and then take him out with a melee attack. Check the chairs to the left of the door that he popped out of for Supplement x5 and then check the small office for 1/4 Rag and 1/2 Binding before heading through the door the Firefly popped out of.
Head upstairs and grab the Surgeon's Recorder from the counter and turn around and check a small room for Marlene's Recorder 1, 1/2 Alcohol, 1/2 Binding, 1/2 Explosive and 1/4 Blades. The office behind the counter can be opened with a shiv to get Supplement x10, Bryony Stewart-Seume - 000304 Firefly Pendant, Rag, 1/2 Blades, Shotgun Ammo x2, Revolver Ammo x3 and 1/2 Explosive.
Exit into the next room and head into the tent for 1/2 Alcohol, 1/4 Blades, and Marlene's Journal. Continue for a quick scene and then wait for the Firefly to turn his lamp and walk across the area. If you time it right he may mention seeing something, but won't fire on you or investigate.
Enter the door and work your way around a gurney and stop behind the crates to the left of the door when the guard isn't look and the other guard is patrolling away from the doorway. Pop in and strangle him and then take cover again.
The next guard patrols in an area where the moving Firefly in the hall can see you, so instead of going inside wait for him to inspect the far door and use your bow to headshot him. There are now three guys in the hall and more in a barricade by the back. Entering the hall will get you spotted, so use your bow to headshot them quietly. The final guys behind the barricade can be taken out with a Molotov Cocktail.
Head through the door and enter the first room on the right to find Marlene's Recorder 2. After that it is a straight shot to the operating room. Shoot the doctor in your way and then grab Ellie and make your linear escape out of the building to trigger some scenes.
