Vice Versa, Part Two

Plot:

The Nekross have destroyed Squiggley but Tom learns that Hobbledehoys exist in pairs, one to cast a spell, the other to retract so they find the second one, though he is very reluctant to cooperate. Ursula teleports Varg into the lair to change powers with him and eventually Tom, thinking like Benny, tricks the creature into putting things back to normal. The Hobbledehoy even likes the lair so much he decides to stay.