User blog comment:BatmanFan2931/Men in the Iron mask/@comment-3423279-20160225003315

That is a hell of a speed mirage, and would make Zoom unbeatably fast, as he can go from Jay's position in Earth 1 to wherever Zoom is in Earth two and back without anyone noticing.

That, and the fact that someone would probably notice that a breach keeps opening and closing when Jay enters or leaves the room.