 The ghostly wizard can also write in the air in glowing letters (episodes 101, "Birds of a Feather;" 106, "Soul Beneficiary").To Harry, Bob is far more than a simple tool or resource; he is a friend and mentor, and both care deeply for each other.The ghost strongly affirms that he would never betray Harry, even though the opportunity has been presented more than once (episodes 101, "Birds of a Feather;" 106, "Soul Beneficiary;" 110, "What About Bob?