Ron had asked Harry to go to Hogsmead to pick up a birthday present for Hermionie. Ron couldn't do it himself as he had detention with Snape.
After a while Ron returned to the common room to find Harry, shaking. Ron asked Harry what was wrong. "When I was in Hogsmead, in Berties & Bots, I saw Voldemort" Harry replied.
Ron was shocked and suggested Harry go see Dumbledore. Harry reliantly went.
He knocked on Dumbledore's office and went in. Harry re-told the events of what happened. The Headmaster sat quietly, listening.
Once Harry had finished Dumbledore stood up and said "That's funny. As Voldemort was meant to meet you here tonight"
And with that there was a loud bang behind Harry...