Imagine the infinite hubris required to speak this line. Dunnhier's blind overconfidence and then summary execution speaks to Nolan's absolute mastery of the cinematic craft, or kinocraft as we say in the business. You see, Dunnhier is a master thief. In answering "no" to this challenge of a potential problem he's reaffirming his bravado about no job being too complex for him. Imagine that, a beautiful mind, snuffed in an instant.
Infinite Hugh Briss was supposed to be a villain aligned with Bane in The Dark Knight Rises; however, Nolan cut him out halfway through the production (pic related was one of his scenes that was removed). He is a notorious criminal mastermind, and his identity was alluded to by Dunnhier as a setup for his planned appearance in the 3rd movie. It’s a shame that the producers didn’t want Bane to have a cohort. I read the original script and Infinite Hugh Briss had a pretty charismatic character and was a sinister, tantalizing addition to the plot.