A new class of dual-touchscreen device is beginning to emerge, either constructed as two screens hinged together, or as a single display that can fold. The interactive experience on these devices is simply that of two 2D touchscreens, with little to no synergy between the interactive areas. In this work, we consider how this unique, emerging form factor creates an interesting 3D niche, in which out-of-plane interactions on one screen can be supported with coordinated graphics in the other orthogonal screen. Following insights from an elicitation study, we focus on "pull gestures", a multimodal interaction combining on-screen touch input with in air movement. These naturally complement traditional multitouch gestures such as tap and pinch, and are an intriguing and useful way to take advantage of the unique geometry of dual-screen devices.