Luca's eyes were fixed exclusively on Elder Gallus. At first, it wandered toward the other two elders but ultimately came back to gaze at Elder Gallus.
"Take the flame user while I go after the other three". He commanded his lieutenant without a direct specification.
In the same way that the elders and Anadon were able to sense the presence of the Grosskon militants and an oppressive one-man presence, so are the sorcerers of the Grosskon militants also able to sense the presence of the Arshbon.
What Luca felt from the Arshbon when he perceived them, was that there was no one worthy of being a notable threat to his army.
He felt the immanence of the elders and Anadon, and from it was able to tell that they were awakened sorcerers of the first class.
Still!!! He did not think that much of them, not even considering that there was al one-in-a-million chance of them being a threat to him.