Gerard's brain hadn't yet finished processing Desmond's words when he felt an enormous tension around his neck, with unheard-of speed Desmond had placed a knot around Gerard's neck and began to drag Gerard to the front of the cell.
Gerard tried to fight, but Desmond had positioned himself behind Gerard before putting the rope around his neck and dragging him with a force that was impossible to resist, Gerard also tried to scream, but his throat was on the verge of breaking from the pressure of the string and made no sound.
Even so, Gerard kept fighting, clinging as hard as he could to the rope around his neck scratching his throat until he bled in an attempt to hold the rope, but Desmond didn't care.
When Desmond finished dragging Gerard up to the entrance bars, Desmond took one end of the rope and ran it over the top of the bars using a horizontal bar for support, and began to pull the rope from the outside; hanging Gerard there from the other side of the cell.