That was the day he knew they'd stopped trusting him, the day they'd thrown his own words ("necessary conservation of information") back at him, the words he'd used when he'd done that spy mission with the werewolves in Serbia and hadn't been able to tell them about it. They hadn't been under orders, they had only decided themselves that it was best he not know, in case he was a spy - and it had hurt more than any Cruciatus. He'd practically blinked and they'd all disappeared.