So the three of them set to task. The Keep was built as an imposing roundtower, encircled by a moat that Hermione and Enola filled with positive thoughts and affirmations about Harry, that they drew from their minds in much the same way as memories would be pulled for use in a Pensieve. They had no idea if this would work, but as a spur of the moment addition to the defence of Harry's mind they decided anything was worth a try. 