Rean and Roan didn't panic. Their only concern was to enter that field filled with Spirits. At the moment, they were quite far away, and with their speed, probably only Stram might be able to pursue the two. If he did that, then the twins would have lured him away from his minions and could deal with him alone.
Of course, they also heard from Arlo that Stram has some way of contacting him, so there was still a risk of having to fight Arlo as well if that happened.
Rean stopped his Light and Divine Sense Bending skill, revealing his and Roan's presence. However, both Rean and Roan had completely different appearances now.
Roan, on the other hand, was curious. "How did you know we were here. Neither your sight nor your Spiritual Sense should have caught our presence."