He is also close to Danny Messer, attempting to offer him some sound advice in episode 1.21, "On the Job", when it appears that Danny accidentally kills an undercover officer. It is also revealed that Danny and Flack spend some of their downtime together as friends. In the series' first episode, "Blink", Danny is exiting an interrogation room and casually says to Don, "Hoops on Saturday, Flack. Don't forget." They are seen together at a basketball game in episode 4.19, "Personal Foul". They also meet up for drinks and pool in episode 3.23, "...Comes Around", and have a heart-to-heart talk about their jobs and why they do what they do. In episode 7.08, "Scared Stiff", Danny teases Flack after he tells him that he is afraid of spiders.