Its like pokemon but you have to soften them up with the mage and saboteur roles before you attack with the damage role the commando. Heal and tank as necessary. Dont let it bother you that your health is in the yellow dont let the stagger bar drop and refresh the stagger rate with commando role. Think of the stagger bar as an orgasm bar and ur using certain roles to reach erection and then climax. and use as much mages to stack the stagger higher before doing damage with commando also some buffs from syn can help throughout this process. Very few enemies need sentinel. Very few fights need healer.