Lu An had a hidden meaning; it was to provoke Arnor to attack them. If Arnor reacted by attacking them after sensing the killing intent, he could kick not just Arnor but the whole Giteron Dynasty. That was his real intention, getting rid of the annoying guy.
Arnor would not take that action kindly. He was about to burst out in anger, but the stone door opened. Three people came out one elf, a knight in white armor, and a human. The killing intent reached inside, so the three came out to check what had happened.
The human was someone Tang Shaoyang knew, Reinar Thamsen. The guy who helped Tang Shaoyang, but also the reason why he spoke in public that this was Earth's first dimensional tower.
Reinar glanced at Arnor and then looked at the dressed-up Tang Shaoyang. He observed the group, and it did not take him a long time to realize that Tang Shaoyang was more than a mere scout.