The fact that these two were here was a sign that there was a dark crystal near here.
Well, the increased monster activity in the surrounding area was already a sign that there was a dark crystal around here. However, it wasn't as if it was a certain thing since I had no idea what the range of effect the dark crystals had.
Seeing that there were two were here, it meant that the dark crystal was almost certainly here.
It meant that they must have been the ones that had brought the dark crystal here.
They might have even been the ones that had placed the other dark crystals all across our kingdom.
In that case, it would seem logical to capture them and then have them bring us to the various dark crystals that they planted. However, that wasn't what I did, I just chose to ignore the two of them in the end.
Even when they stood up and walked out, I didn't do a thing.