AFF Student pulls the Jumpmaster cutaway handle - EPIC!

The student accidentally pulled the cutaway handle of his instructor, right after exit the plane. This cutaway handle is used in the event you have a malfunction with your main canopy (if it rips, gets entangled, etc). It caused the cutaway on the main at the moment the instructor deploys it, leaving him only with his reserve, don't give him not a chance to fly his the main canopy. It all happened with no intention of the student. He told us after landing, he wants to grab something to keep his balance (