You still don\'t know what is being a psionic about? Here you have it. This spell causes victim to become schizofrenic, so in combat he often hits himself instead of his enemy, thinking that he is someone else... Being of two minds about things is also not helpful for spellcasting. When trying to cast a spell in this state there is 50% chance that one part of the mind would consider another part to not belong there and breaks the spell.

See also: soul echo, confusion