This triggers a quick cutscene as the Knights round the corner to the next area (29), an open central atrium called the Grande Lounge. When a bullet grazes Igraine’s shoulder, she “repairs” it by drinking from a small flask hung around her neck. This is the legendary Blackwater that instantly heals Knights of the Order and allows them to live for hundreds of years. Afterwards, Igraine suggests using smoke grenades.
Clear the Grande Lounge
Press the up-button on the D-pad to equip one MK IV-S Smoke Grenade. Press and hold 
(left trigger) to aim the grenade; you see a white throwing arc appear onscreen marking where your toss will go. To throw the grenade: press and release 
(the right trigger).
Note that each grenade has a fuse countdown, meaning it won’t detonate until five full seconds after you first push in . So if you want, you can hold in to “cook” the grenade—that is, to start the fuse countdown while still holding the grenade. This way it explodes sooner after you toss it. Don’t cook it too long, though! Get rid of it before the five-second fuse time ends.
Once the smoke is released, foes caught in it become disoriented and cannot fire. Move in fast behind Igraine, stay outside the smoke cloud, and pick them off. Push forward but watch out for a hidden escapee who suddenly hops over the counter of the Wallace Bar on the left (30). Take him out! More attackers emerge from across the atrium, so use the bar for cover.
Once the Grand Lounge is cleared, Galahad reports more enemies on the level above. Before you enter the building, climb up onto the piano platform near the Cigar Bar. (You can use 
to just pull yourself up the railing.) You see the innocent bystander who got pushed off the balcony above; you can also find an ammo crate (31) in the corner.
Follow Igraine
Follow Igraine up the stairs under the “Dining Hall” sign. En route, be sure to look around for useable ammo from fallen foes as you go—make this a regular habit after each battle! Then move around the corner toward the elevator (32) to trigger a cutscene.