From their website:
In the Eccentric Scientists club Ingrid Rangvaldottir with her Sun Sword rifle is the main sniper and fire support. She is a Troll who invented a way to forge the fiery passion that drives most Trolls into a deadly weapon. Her Mirror Servants allow her to draw line of fire around corners by deflecting the Sun Sword beam off their mirrors.
These are the special Henchmen models that are available to field with Ingrid Rangvaldottir. They allow her to draw line of sight through them, as the beam from her weapon is deflected by their mirrors, making it possible to keep Ingrid safe around the corner while she’s shooting!