Ah yes, describing the gear. It's something Armin has had to do plenty over the years as apparently no other world had something similar --then again, as far as he knows, no other world had titans either-- and he sometimes wonders how well he has managed to make people understand what it is.

Then again, maybe it is good people don't understand it. It means they never had to deal with titans.

"Where I come from, we have to deal with entities we call Titans. Most are anywhere between three and fifteen meters tall, and unfortunately, the only vulnerability they have lies in the nape of their necks. So our scientists developed what we call the Three Dimensional Gear. It is essentially a device that helps our soldiers be able to get off the ground by scaling buildings and titans, and attack them where they are most vulnerable. That and dodge their attacks. The device functions by using two anchor hooks which are shot at high speed into any tall object, after which the engine quickly retracts the wires pulling someone off the ground."

He's being a bit more in-depth right now than normal because he figures the talking might keep her mind off the flying.

"Wait, maybe this will help." Armin digs a notebook out of his bag and makes a quick, very basic sketch of a human. To that, he adds a crisscrossing of straps across the body and a rough box shape for the actual device. "See, the motor is carried low on the soldier's back, and the anchor hooks shoot out from holders on either side of the person's hips. The straps keep the device against your body, and allow you to steer yourself and maintain balance while you move."