Sean entered the library alone, with only a notebook and a open can of Monster on hand. He wore a sports jacket even though it was a bit warm for it. He headed right to the table and the deck plans.
"You've been impressively busy." He commented to Cath.
This cinched it. Cath had military experience. He hadn't mentioned it, but everything about him since they'd met pretty much said it. He'd likely seen combat as well. Might be why he hadn't mentioned it, some scars couldn't be seen. Just cause he was a librarian now doesn't mean he'd always been.