When Arman turns over the dead body of Cem lying in the water, the body turns around easily and softly and arms move limp and freely. But, if Cem had died right in the morning at the first rays of the Sun and had been lying there over the day in direct Sun light, then rigor mortis would have set in in no more than 4 hours and body would have become rigid like wood or stone, individual limbs would not be moving freely and independently.