Caridoc says "Don't try and fool us into going outside. Its obvious that you and your unconscious friend where guarding an entrance. As this is not visible, there must be a secret door somewhere." Although his comment was addressed to "Red", its clear that he is also filling in the others.
Rather than follow "Red" outside, Caridoc rather obviously starts searching first the wall and, if he fails to find anything, the floor for a secret door.
[sblock=OOC]Perception (untrained): = +5 (+2 (Keen Sense) +3 (WIS))[/sblock]