The king's eyes widen in surprise as the bots were suddenly lifted from the ground before deducing the source of the attack - giving a faint nod in Shepard's direction as he pointed the now fully charged sword at the machines. "You might want to cover your eyes!"

When the stored up electricity was released was less like a lightning strike and more like an ion cannon - practically incinerating the robot caught in it's direct fire and frying the rest that Shepard had lifted up.