Our Warriors go into sword+board D stance and Shield Reflect when they see the AP animation or if they're getting focused. It helps -tremendously- when the other team is trying to kill your Warriors.
Nature's Swiftness has helped me prevent a lot of insane burst combos (2x AP Fire Mages + Destruction 'Lock.. Our Warrior went from 100% to 2% to 98% to 3% to 90% to 5% seconds into the fight...), but I see that your team lacks an instant heal.
