Newly acquired defensive end Mark Anderson gave the Bills' offensive line fits during Tuesday's minicamp practice on the grass field behind the Bills Fieldhouse. Anderson, the free-agent acquisition from New England, was in the backfield on the third play of the 11-on-11 session to force Ryan Fitzpatrick into an incompletion. He beat left tackle Cordy Glenn on the next play and forced another incompletion. He forced Fitzpatrick into an incompletion on the first snap of the QB's next set of 11-on-11 plays. On the next play, fellow defensive end Mario Williams batted down a Fitzpatrick pass. Anderson had a would-be sack of FItzpatrick on the first play of red-zone work, too.