Actually, Hazel only needed something to make sure a bullet pierced through that man and woman's skulls, because that was the only reason why she purchased this beautiful gun in the first place.
Hazel knew Rize because she used to get her supply from him, in a special case when she couldn't get it from her family's link.
They were not very close, but at the same time, they had known each other for long enough. You could say a decade. He was a few years older than River, and she used to see him like a Big Brother. Even though, their relationship was not that close, since this man used to give her a random advice without being asked.
Rize was still the same like the last time Hazel saw him. His curly short hair looked a little bit messy and he smell like tobacco because of how much he smoked every day, which always made Hazel scrunch her nose because of the smell.