The second that the weird guy who'd had her sitting on his lap while they shared her lunch a minute earlier asked "Can you keep a secret?" Mary knew that it was time to get the hell out of there...
The angel Simon, who had been about to transfer the Dark Soul that he'd stolen from the dead soldier earlier, had instead found himself being handcuffed to a gurney and hauled into an ambulance by a Sheriff's deputy and an EMT who looked at him with disgust the entire time they did so. Rather than coming to take the soul like he'd thought she would, the little girl named Mary ran off screaming for her teacher who had yelled something about calling the cops before alerting the local authorities to Simon's presence.
Humans were strange, and had odd customs. He'd apparently broken some sort of taboo without meaning to.
Just what had he done wrong?
He didn't have much time left in the world, and he needed to hide the soul he'd taken fast before Gabriel arrived. He turned to the deputy who was saying he was sick. He didn't know why the man was saying that though, since he was injured, not sick.
"Can you keep a secret?" he asked.
