Harry moved quickly towards the Atrium, he had stopped in a restroom before leaving his Muggle assignment to throw on an set of robes, take the gel out of his hair, change his glasses, and remove the glamour on his scar. In other words he turned back into Harry Potter.
He apparated from there to avoid questions about his dress. He spotted Draco in the atrium and headed over.
"Hello Draco how was training today?"
Despite the excitement of what he was doing he really missed it.