It was in that moment that Harry knew he was utterly fucked.
Let's go back a couple hours where Harry and his friends are in the Department of Mysteries.
Harry and his friends were being chased by Death Eaters and got separated from one another. Harry got chased into the Time Turner room when Harry dodged a blast of magic coming from non other than Bellatrix. The blast of magic hit the Time Turners near Harry and caused a chain reaction which sent him with a pop to another time.
Where Harry landed it hurt like a bitch and blacked out where he lay.