His train of thought was broken with a sharp  crack . Wormtail had been thrown bodily against the headstone Harry was tied too; he noticed with a kind of drunk vagueness that Nagini had slithered out of the way at some point. Voldemort and Wormtail were talking, but Harry didn’t listen. If this was like all his other nightmares, he knew what was being said. He tried to gather his thoughts again but was sabotaged by the sudden blistering pain in his head - ah, he should have remembered that. He was distantly aware of the high-pitched chuckle Voldemort gave in response to his own pained shout of frustration.