Greg paused; he had been raised with manners but just hadn't been required to use them as much as all of that. He extended his hand, in a greeting of familiarity, to shake Zach's hand should he offer it back, "I'm good. Better. Much better now," and Greg let his guard slip slightly and he smiled at Zach, a real smile.
"Theo's...well....he's better than he was. It's going to be a long journey, back from whatever hell he threw himself into. He...," and Greg lowered his voice. He didn't really want Theo to hear, "I found out that he killed his dad. In battle. That's what did this. His fucking dad. Even dead, the bastard haunts him. So, don't be alarmed if he talks some weird shit. He's...it's his way of cooping."
Greg offered this to Zach, knowing it might help soften some of the shock. Zach was Theo's friend; he'd visited him in St. Mungo's and he was here now. It was clear he cared for Theo, and Greg had to respect that.