Shannon's loss took a heavy blow on everyone on the island, but Sayid was the one who suffered the most.
He had fallen for her, after weeks of getting over his past, just for her to bleed to death in his arms.
He couldn't bring himself to say much during and after the funeral. The girl was buried, and Sayid noticeably distanced himself from everyone else.
He was quieter. Not involved anymore.
Then the hatch was another problem. But pressing a button to avoid the unknown, he wasn't as opposed to—if anything, it helped him clear his mind. Have something to do other than to dwell on Shannon's last breath.
He had gone to the hatch during his shift to find Charlie and Hurley chatting over some vinyl records.
"This song is depressing," he had said, voice quiet and monotone as it had been for the past few days.
Charlie and Hurley left minutes later, leaving him alone. And you, not remembering it was time for his shift, entered the hatch as well.
When you saw him by the counter, sipping on water, you realized he knew you were there. He didn't say a word, not even a sound, but his shoulders tensed, back straightening.