Kristen Marx in her Elemental. In the future I'll have to work out an defined look for the progression of Elemental armor designs during it's development in the story, but shown is Marx employing her earlier and more crude abilities.
One of the easiest offensive employments of energy shielding is to run the field extremely hot and pass it through the enemy. Shown is a pillar field being extended, appearing as a beam of fire. Also on display is "skating", sliding on a blade of shielding, using the rule of cool technique