It's okay now, mom, he's safe now. And try not to be angry in front of him, so he won't get more worried for next time. When he's in school tomorrow, call who ever is in charge and THEN read them the riot act. Demand they write a letter of apology to Jaden, and explain to him that they are very sorry that a mistake was made. Ask him what would make him feel better, and reassure him that this will NEVER happen again.

Tell him he was a great boy for being so brave and waiting so long, and you know he must have been worried, but you are glad he was brave and stayed put in a situation where another boy might have tried to walk home, or done something foolish. How proud you are, how brave he was, how glad you are to have such a brave, smart boy, when some of the adults were not nearly as smart!