While pocket carry isn’t ideal, that’s what this dad chose at this moment, and was able to make quick moves once he verified that it was indeed danger that had followed them.
This dad and his family were walking up to their home at night, and he was the last one in line, paying attention to things around him the whole time. We can see his hand in his pocket, later understanding that he’s holding a handgun.
As soon as another man, with a gun, comes up behind them, he quickly draws and fires. This is more than enough to make the armed man flee in fear of his life, and likely saved this man and his family from a multitude of problems.