The glider tilted to the right from the start of the take-off run. As soon as the student-pilot noticed that the glider was tilting, he tried to counteract this movement with control stick and rudder inputs. Then, realising that he could not keep the wings level, he immediately pulled on the release handle, as recommended. This action was ineffective because he did not pull with sufficient force in respect of the cable tension. He pulled on the handle a second time and with greater force in order to release the cable. During this time, the glider pivoted around the wing while on the ground, lifted up about one metre and then fell back down.