You didn't work for the Peaky Blinders, but, you were a very close friend of the Shelby Clan. You had, essentially, grown up beside Ada Shelby for the majority of your lives. So, it was like you were family to them. And when someone threatens your family, you feel the need to protect them. Which is why you found yourself in quite the predicament. You hadn't even thought about it, you had just heard from the Shelby's about Luca Changretta, and how he had been threatening them, how much death he had caused already. And that's why you had pressed the gun against the male's familiar looking, as the Shelby's had described it, tattoo. It was a thoughtless decision, and you don't have much leverage to make threats, but here you were anyways, ready to defend the people you cared about.