Loss
Nobody had seen Shepard since they returned to the Normandy from Virmire. The cloning facility was destroyed but Ashley lost her life. She sacrificed herself to save the rest of them. The whole crew was silent, dealing with the recent loss.
Garrus knew Shepard best though. He knew exactly where she was. At a time like this, it made sense that she'd hide from the crew. Down in the cargo bay, in the very back corner of the room that was concealed by the Mako was a known hiding spot. Garrus found her on the floor, hugging her knees to her chest. He joined her.
"She was a fine solider" he said.
"I know" she replied, voice soft.
"Do you want to talk about it?" he asked.
"No" she said "Just...stay here with me".
"Of course" he replied.
Moments later, she leaned against him. Garrus was surprised at first. He glanced down to see his Commander resting her head on his shoulder. He was tempted to move but then stopped. She needed the comfort. So he let her rest against him as they mourned Ashley in the silence of ship.