One of the primary elements of a successful raid involves a clean entrance, one with the ability to catch the enemy off-guard.
As soon as it was confirmed that the individual who posed the biggest threat to them, Zenonia, had left the compound, Eeshoo decisively gave the group the signal to go.
To avoid the hordes of Nightwalkers heavily filling up the area, the group ultimately had to go through what used to be the underground city sewer. Moreover, even though the area was not under the Nightwalkers' watchful eyes, they still did not dare to make a sound for fear of the sewer being filled up with the creatures.
With Atlas's [Seismic Scan], it took them a few minutes before they finally arrived under the compound gate, the exact location used by the last acolyte to escape. However, the formation that was supposedly broken stood stable in its position like brand new, as if it was never even damaged in the first place.