Frankly, we'd advise against crossing anyone given to costumed superheroics, but a policy is a policy. Book selling giant Barnes & Noble has begun pulling select DC Comics from store shelves this week, in response to a deal struck between the publisher and Amazon, which will make digital copies of a number of comics exclusively available through the online retailer for use with the forthcoming Kindle Fire . The move is part of Barnes & Noble's policy to remove physical books from its shelves if the available digital version of the text is not offered up to the company. According to an exec, "To sell and promote the physical book in our store showrooms and not have the e-book available for sale would undermine our promise to Barnes & Noble customers to make available any book, anywhere, anytime." J'onn J'onzz has yet to weigh in on the matter.