AFF Student pulls the Jumpmaster cutaway handle EPIC

The student accidentally pulls 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 giving him not a chance to fly his the main canopy. It all happened with no intention of the he told us after he landed, that he wants to grab something to keep his