There are several glaring errors with the concept of Sam Blake being ex-special forces, not least that he chooses to take down a target from a multi-story car park, in the middle of the day. He is then so surprised by the appearance of Mr and Mrs Average, returning to their car, he completely loses his composure, makes a big scene and wheel-spins out of the building leaving two frightened and confused eyewitnesses and - more importantly - his spent cartridge case (or evidence, as forensic services like to call it).
But the biggest fail, in my opinion, was him walking into a battle-cruiser (boozer) carrying his lo-tech sniper rifle (albeit in a flight case), following his mark into the karzy (toilets) and going through a very prolonged punch-up with him; in black ops terms, the equivalent of strapping a large number of pots, pans, bells and cymbals to your kit before commencing a covert op. After he's finally managed to neutralise the target, he comes back out of the bogs (toilets) and is recognised by one of the customers. He immediately pulls out a Glock (never heard of a silencer, Mr Green Beret?) and leaves the nuclear sub (pub) with no sign of the big black gun case with which he had arrived - presumably a bit of a handicap for a crack-shot sniper with several target left on his to-do list.
But the biggest fail, in my opinion, was him walking into a battle-cruiser (boozer) carrying his lo-tech sniper rifle (albeit in a flight case), following his mark into the karzy (toilets) and going through a very prolonged punch-up with him; in black ops terms, the equivalent of strapping a large number of pots, pans, bells and cymbals to your kit before commencing a covert op. After he's finally managed to neutralise the target, he comes back out of the bogs (toilets) and is recognised by one of the customers. He immediately pulls out a Glock (never heard of a silencer, Mr Green Beret?) and leaves the nuclear sub (pub) with no sign of the big black gun case with which he had arrived - presumably a bit of a handicap for a crack-shot sniper with several target left on his to-do list.