Theodore was worried too, but he had been in the middle of a workday when he'd gotten Zach's note. Had it been an immediate emergency, of course he would have left work immediately, but it hadn't seemed that way. Yes, he was concerned that Zach might be considering suicide, but he had gotten himself to work, and Tracey had gone to see him, so Theodore had calculated that it was probably best for him to finish work. There were, after all, patients that did need immediate medical attention.
He'd aimed to get off work early, and managed it; he Apparated straight home as soon as he was done. If Zach was no longer here, Theodore would go looking for him, but he heard the sound of voices.
"I'm home," he called from the entranceway downstairs, as he took off his healer's robes and hung them up. Then he moved up the stairs into the rest of the house. "Zach? Tracey?"