It was not only him but everybody was so. Nobody expected a magic circle to appear in front of the sixth gate and make the people around it disappear.
"I think that was a teleport circle, those people who were standing there might have been teleported inside the door" Hallie mused. Her master Karina was a little accomplished when it came to the field of space magic.
Being her direct disciple, Hallie too learned a few things. From what she could tell, those spatial fluctuations when the magic circle arrived, were definitely from the usage of space magic.
This is to say, that the people near the sixth door didn't just disappear but were actually teleported somewhere. This explanation of her was much easier for others to accept than the mysterious disappearance of the people.