After entering the Foundation Establishment Stage, the effect of his Spiritual Sight greatly enhanced, transforming the surrounding environment into silver lines in his Divine Sense. Although his main purpose was to watch if the enemy had arrived, he incidentally noticed the situation on the other floors of the inn as well.
The guests below them turned out to be a group of werewolves, which surprised Lancelot somewhat - half because this notoriously fierce race would actually pay to stay in an inn, and the other half because the innkeeper was willing to accept these customers, who were barely better than wild beasts.
