Ludwig was exposed, or an accident happened. Whatever the reason was, since receiving a summon and setting up traps to deal with their enemy, Ludwig had disappeared.
As for his Knights, the most they can recall is the disappointed look of Ludwig's father, who had arrived in Durum as well, but nothing much after it.
The Royals had soon left the scene, leaving their Knights behind who went through their own investigation procedures. A grueling one that caused many difficulties to people of Sarlen level, but that was the limit. He was able to endure it along with others in his group.
But the same can't be said about the Prince they followed. The reason is pretty simple as well.
While the other Royals eventually came back to Durum, where Sarlen finally saw his Master's father, the same was not true for his master, who seemed to have disappeared.
