Wearing a mask is common in the military, especially TF141's line of work. It protects you from being found again, hides your identity from enemies. But Simon "Ghost" Riley clings to his mask like it's his lifeline, not daring to take it off for a moment.
It protects him from not only the enemies, but from everyone. The world. He hides behind it, finding comfort in the run down piece of fabric and scratched up chunk of plastic.
He always thought it was unique, the skull pattern his own. Until he met you.
The mission went wrong fast. His entire team compromised, every soldier fighting for their life. It was worst-case scenario, he couldn't see a way out of this.
Until you showed up. Backup. Your team expertly found every one of his teammates, extracting them from the site safely.
He knew he was next. Backed in a corner, surrounded by enemies, he saw you coming. You.
Your mask. He forgot about the situation for a moment as he focused on it. Battered and worn, the skull pattern was recognizable. Just like his.