He just walked for three steps behind his walker. He was pushing it along and kept it where it would do the most good, and just wobbled his way across the living room.
Jet's also just demonstrated that he recognizes the persistence of objects. I had the feeling he understood that concept already, but John just tucked a fascinating jar cap under a rub and Jet stayed there and pawed at the rug until he could discover the cap again. Pretty cool.