Season 2: Ancestors

Eventually
Catherine lowers the gun with disappointment and pain clear in her eyes. When
Vincent threatened to kill the thief, directly recreating the scene of
Catherine having to shoot him to save Reynolds’ life, this time Catherine was
incapable of shooting Vincent again and the pure depth of disappointment in her
expression was potent.
It felt like if, at some point, Catherine was tired of
fighting and when she watches Vincent get violent you can see her heart break.
So, they both back down and Vincent gets away with the gem.😞