Artemis' heart was filled with gratitude, seeing how easily Landon agreed to help his people.
Though Landon had arrived and initially promised to help them, Artemis and the others were still not at rest because they hadn't fully told Landon all the dangers ahead.
So seeing him agree now, finally dropped the heavy stones in their hearts.
After all, the task itself was indeed a ghoulish nightmare to accomplish. So they wouldn't blame anyone for turning around and not helping them.
The event was also foreign to them because they had never heard of any place like Adonis/Lampe before.
In truth, they were inwardly suspecting it was Morgany trying to play a fast one on them.
At this point, they don't know what to think. It's funny that they know of Morgany but don't know where Morgany was located. The Morgs forcefully created their bubble, and they weren't privileged to go beyond this.