I have a thing for dysfunctional teams/fucked-up psuedo-families. I get tired of those typical, "I WILL DO ANYTHING FOR MY FRIENDS!" nakamaships, so mouthy, disobedient subordinates shooting at each other was right up my alley. XD I freaking loved Ianto snarling at Jack about Lisa -- I believe it was something like "when there comes a time to save you, I won't"? How many times do you hear that from TV teams??