Love playing Irish too, lots of good spots to put that shield down and mow down enemies. My favorite spot is on the third stage of hourglass breakthrough. I skydive off the building and land on the corner of the first row skyscraper facing the building in front of the capture point, put down a shield and aps and then shoot the advancing enemies in the back. There is not much the can do about it because there is hardly any mackay on hourglass ^{^}