Virtuous Moonlight
The repulsive force which pushed Nero back was so strong that it nearly knocked him on the ground. Bael, who ran in right behind Nero was also pushed back, and looked forward in confusion and panic.
Beyond the door there seemed like another room, but the view of it was blocked by a wall. There were clearly paths going around the wall, which meant the sole purpose of the wall was to block the view.
There was no time to consider why the wall was there, or what the room was hiding. Nero could tell the only reason he was pushed back was because he was carrying Silas, so he put the teenager down.
A part of him recognised that depending on what he found in that room, this might be the last time he saw Silas and Bael, and that death might be around the corner. Somehow, despite that realisation, a lifetime of training himself to maintain mental clarity prevented him from letting fear and desperation take over.