After the battle inside the Ziggurat, Chizuru and Hayate are horrified to find out that their victory would have cost Koyori her life. They agree to help Tazuna and Koyori, even though they're out of the fight now.  They tell the two of them that in order not to be found in the real world, they need to come up with a name to use inside the Ziggurat when they fight.  After a bit of thought, Tazuna and Koyori's new name becomes "Single Gear".
There's also data that shows if 
you get over a kilometer away
هنالك بيانات أيضاً تشير إلى أنّك إذا ابتعدت
أكثر من 1 كم
Wenn man sich mehr als
einen Kilometer vom Gegner entfernt,
Y si se alejan más de un kilómetro,
Y si se alejan más de un kilómetro,
Et si l’un des deux groupes
en sort,
Al contrario, i dati dimostrano che
Também há informações de que se 
você se afastar essa mesma distância