As the 2nd half of ants were returning to the hive, they commenced a thorough search on their way back.
To show the level of intelligence the queen had, it had ordered the ant generals to eliminate the humans that had shown themselves and not conduct many searches.
The aim of the command was for the ant army to block the borders, therefore trapping the humans.
Now that the mana pillar had appeared it was time to start phase 2 of eliminating the humans.
On their way back, the army of ants began searching every corner and climbing every tree. Due to their large numbers, it didn't take much time as they were moving closer to the hive.
When the ants had gotten halfway back to the ant generals which had very high sensory abilities began detecting the teams.