The Sun reports that the wounded officer arrested the same defendant in 2007.
That's scary. It's much harder for a police officer to remember everybody he's arrested than it is for a criminal to remember the person who arrested him. It's just a question of numbers, like it's easier for students to remember their teacher's name than vice versa.
It's also why cops carry guns off duty. The last thing you want as a police officer out on a date is for somebody to come up to you and say, "You remember me?"