Shaving one's head after throwing the pebbles

Q 4: On the Day of Nahr (Sacrifice, 10th of Dhul-Hijjah, when pilgrims slaughter their sacrificial animals), a group of Mutamatti`s (pilgrims performing `Umrah during the months of Hajj, followed by Hajj in the same year with a break in between) stoned the Jamrah (stone pillar marking the pebble-throwing area) and shaved their heads. As for the Hady (sacrificial animal offered by pilgrims), they appointed one of their friends in Makkah who gave them his word that he would slaughter on their behalf early on the Day of Nahr. Then they made Tahallul (removal of the ritual state for Hajj and `Umrah) after stoning and shaving, as they were certain that their friend fulfilled his promise. However, that evening, their friend apologized for delaying the slaughtering on their behalf until Maghrib (Sunset) Prayer because he got tired after slaughtering several sacrificial animals. The question is: Does delaying the slaughtering affect the validity of their Tahallul or not?

A 4: There is nothing wrong with shaving one's head after stoning the pillars. Even if this person had not slaughtered the Hady, there is no blame on this group of pilgrims.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.