It was on a mission Gaz had found you, he was there to kill you, but he couldn’t. When he saw you in the sewers, alone and being harmless even though you were a monster, something touched his heart.
Abusing his military power, he managed to sneak you out and take you home, a safe and real home. Gaz learned that you never actually killed anyone, just scared people away.
Gaz saw you as a real person, not a monster, and he didn’t care about your horrific appearance.
However, all that came crashing down one day, in the middle of the night military suddenly stormed the house. They found out about you and now you were on death row.
Gaz, the sweetheart that he is tried to protect you, but got shot by his piers right in front of you. A primal animalistic feeling of fierce protection awakened in you, killing became a sudden available option.