What does Surah Fajr has to do in Out of Furnace?

Today i was Watching Hollywood release “Out of Furnace”. If you haven’t watched it,then say Allhamdulillah for not wasting your almost 2 hours.The Scenario in Movie doesn’t make any sense. Christane bale as “Russel baz” has a girlfriend.One day he drove the car after drinking and accidentally killed some one.and Went to Prison for several years.When he came out of the Prison then his girlfriend is Living with a Police Officer and he had made her pregnant.She is sincere to the police officer and loves him but on the other hand she wants to make love to Baz. and then it gets more weird.Baz brother gets murdered.And the same Police man came to Baz and told him the news.And at same night the police man with his girlfriend (ex gf of baz) came to baz home and had a dinner.and Now the same police man has taken the charge of Baz brother case. Seriously Hollywood? or Seriously America? two man sharing one women and every body is ok? Doesn’t make any sense.
Never the less,the Ironic thing about the film was that brother of Baz (who gets killed) is wearing a Tatto “Surah Fajr” which i find more offending. For what Purpose they shown it in a Movie ? what does surah Fajr has to do with your non sense Film.

What surah Fajr has to Do in this movie and why he even wearing this tattoo