The rules and codex supplement clarifies that Reverse Attack changes the target to the source of the spell, which is usually the same as the attacker but not always. Such as with Chain Lightning, which is the best precedent imo. Basically the attacker stays the same through all of this, but the source and the target switch. So you'd end up with this situation:
1. The original caster (Forcemaster or Thouhgtspore for example) is STILL the attacker.
2. The original target (the opponent's creature for example) is now the Source of the spell.
3. The Mind's Eye is now the target of the spell.