"She needed a boost to cast the first spell.  Without the inherent field kick in Starswirl's spell, she'd have never made it back on her own." Fancy Pants returned to his table and pulled a scroll out of his attache case. “I wonder,” he began as he walked back towards the witness stand, “if you might suggest where best to modify this spell—a spell which my client could not even cast without the help of Princess Celestia's magic—in order to pre-load it for markers?”