Why did Atticus massage Jem's hair after he directly disobeyed his command to go home?Could use the answer pretty fast please. Thank you.

Atticus may have been a bit angry at Jem's initial refusal
to leave the jail that night, but he wasn't angry afterward. The children's (Jem, Scout
and Dill) arrival at the jail saved the day--and probably Tom Robinson's life. Atticus
was alone at the jail when the lynch mob arrived, and it is unlikely that he would have
been able to talk them out of removing Tom from behind bars. Atticus himself may have
also been hurt. But the children's sudden appearance quelled the intentions of the men,
and Jem's refusal to leave may have saved Atticus from injury. Although Scout and Dill
seemed to be oblivious to what was happening around them, Jem sensed that something bad
was about to happen. Atticus was proud of his son's decision to stay, and rubbing Jem's
head was his way of showing the pride he had in his son.