Lissa couldn't get any air into her lungs...
She couldn't breath...
Jace started panicking and thought she might need water. This is new to him. He quickly snatched a glass from a nearby table and brought it closer to her lips, but water would be useless, she pushed the glass out of his hand, letting it fly across the room. She clutched her throat with her hands. It felt constricted. Like someone tied a knot in her oesophagus. Of course water would be useless. She needed oxygen, not liquids.
Lissa knew then, that everyone was staring at her...at them, but she couldn't care less about the spectators. Her oxygen tank was in the car, but no words seemed to escape her chapped lips, so she couldn't tell him, luckily she parked her car right outside the window.
She pointed her index towards her car.