In the testing room, the soldier who had set up the test, as well as everyone else, were all startled by the change. What kind of technique was this? They had seen a lot of different kinds of techniques, but never one that turned an entire army into a seemingly massive robot.
To be clear, the battlefield they were currently at was not run by the Jotun empire, but by a subsidiary force of the Elven empire. As such, they had a much greater exposure and history than that of humans. Still, this was something completely unprecedented. Moreover, it was not the optics of the situation that was an issue. Even in the control room, separated by a protected wall, they felt a sense of danger.
In the testing hall, neither the invading force paused nor the Midnight mech. Even Z did not pause to appreciate how awesome this moment felt for him. Since the Innkeeper had trusted him with this responsibility, he would live up to it.