yeah, you use the dodge skill first (called formless feint). It slowly drains stamina, but during that time, u can auto-dodge ANY attack. This includes skills you use that would damage you, like the second skill (that fire explosion skill, called "Blades of the Pyre")Wait so school me you gotta use both of them?
so basically, use formless feint, then spam the explosions for free damage
again, both of these are master skills for the thief vocation. u get them at the Nameless Villlage, east of Melve.