Shawne Merriman, Brad Smith make quick impact for Bills

Two of Buffalo’s big offseason signings made a quick impact in their Bills preseason debuts. Shawne Merriman picked up back-to-back sacks on Bears’ Caleb Hanie late in the first quarter Saturday night. Sure, caveats apply.  It was the Bears.  Both sacks could arguably be called “coverage sacks.”  We are still impressed. Merriman showed a great…