Ten minutes after the perpetrator fled the premises.
*promptly* Ten minutes isn't a lot of time, doctor. Certainly not enough to bring up questions of negligence when half the city is falling down around you. You may have also noticed from the security tapes— *(he's seen them, too, of course, or rather forced himself to watch them once and never again since)* —that the Fountains were a little busy at the time.
That is why I ask whether he exhibited any odd behavior before then
*shakes his head again (you're not listening)* He'd been traumatized by his ordeal. I hardly know what might count as odd behavior in that situation. *pinches the bridge of his nose* But what you're forgetting is that Erestor did react. In his report, he of course mentions running into Gothmog. *swallows (that's sort of a horrible thought, in hindsight)* He knew there was something wrong about him. The right instinct kicked in. His choices after that really are irrelevant to your mind-control theory. Erestor wouldn't have done anything differently, in any case. He saw blood. His colleagues were in danger. I was in danger.