The veil room
Just as Sirius was falling into the veil
As Sirius was just beginning to reach the veil, Harry yelled "no this timeline ends now TIME OUT!"
Everyone froze and could not move their body except for their eyes that they used to follow Harry as his glamour dropt revealing lite blue skin, white hair, and completely red eyes, with his scare now going through his left eye.
Seeing that the others could see what was going on as he moved Sirius from danger, 'Harry' sighed and then mumbled "stupid missing time staff".
"Well you must be confused," 'Harry' said as his left hand glowed blue and stuck it into his head pulling out a black blob.
"Ah much better" 'Harry' sighed as his body shifted to that of an old man, then a child, then back to his original age. "I am Clockwork the Master of Time. The idiotic Observants didn't like me fixing dieing timelines so they sealed my powers and sealed me into this body as it was still forming inside of Lily. This turned me into a Halfa like the one I changed time for," Clockwork then turned to the two frozen open doors one that Dumbledore had just exited and the other open to a black void of darkness. Clockwork smiled as a small clocklike portal appeared next to him dropping another far bigger black blob that joined the first. "Now I do believe this belongs to you child," Clockwork said as he sent the blob into the black void "TIME IN!"
Even as time continued everyone stared in shock as the black void cleared and a sixteen-year-old boy in Slytherin robes fell into the room. "Ow," he said then looked up showing the room a sixteen-year-old red-eyed Tom Riddle, who blinked and then asked, "this isn't the Slytherin dorms where am I?"