Trivia: I don't speak Spanish, however, after asking my fiance (from Mexico) to carefully watch the scene when Memo talks to his right hand man, it explained the movie better. If you know Spanish and listen to the dialogue carefully, you hear Memo asking his right hand man to kill his son. That explains A LOT.
Sean Vetter: They call us down here. They take away our weapons? They expect us to go into a building full of drunken cartel gunmen unarmed? I mean, that isn't fun.
Ty Frost: You're not gettin' paid to have fun. Good luck, gentlemen.
Sean Vetter: I tracked you for seven years. You never went to the same place twice. Until you came home.
Memo Lucero: I told you you had no idea what you were getting yourself into. If you'd stayed out of my business, your wife would still be alive. Mira, cabrón... Your arrogance killed her, not me. Like your arrogance coming here! Do you think you could come into my domain and kill me?
Sean Vetter: If I wanted you dead, you would be.