Yup he actually did a very good job. Attracting the zombies and he was able to pick his targets cause his gunfire waa masked by the multiple gunfire from Mendez and his men. For a lone gun that was a very good tactic given the scenario. The only time his position was revealed was because a zombie messed him up causing him to tumble outside his concealed position. He could have picked them all off actually amidst the commotion.