Aery didn't hear it, obviously, but Ame and Silly did, and their reaction was instantaneous.
"Crossbow, Ame!" Silly shouted, practically flying around the room, stuffing knives, throwing stars, sling pellets, crossbow bolts in every pouch, pocket, and sheath on her belt. She went for some of Rowan's daggers and Aery grabbed her by the back of the tunic. "No, Silly, those aren't yours!" she said. Then, looking at Ame, quivering in fear, she froze.
"What's going on?!" Aery asked, terror making her voice shrill.
Ame signed to her, hands a blur. PEOPLE-MANY OUTSIDE. A-E-L-I-N CALLING US. THINK ENEMIES.
Aery sighed, feeling a wave of pain at just the thought of trying to run in her condition. But she stood up, putting on an armored tunic, though her hands were shaking too much to do up the laces. "Rowan, help me with this?"
She put on her armguards, took one of Rowan's spare longbows, only to realize that she couldn't draw it in this condition. So then she put that back. Didn't have the coordination to use a sling. That left knives, needles--No, she didn't have any, they were all in her pack in Xandria!--and a sword. She picked up one of Rowan's lighter swords, only to realize that she couldn't even get the tip off of the floor, much less swing it. Knives it was, then.
She took as many as she dared, six daggers and two longer knives. She winced as she stumbled down the stairs, but sprinted as fast as she could over about a sword's-length from Celaena. The attackers were still half a mile out, but she could clearly see on their faces...Either fresh blood or blood-colored masks. She exchanged a look with Celaena to find her terror mirrored there.