After a long video review the third umpire decided that Wade, who had already walked off, was given out.
"I had no idea of the rule really - once he hit outside the field of play I didn't know if he was allowed to touch the ball or not," Wade told match broadcaster Channel 7. "Umpires said he was, and once they told me he was allowed to (go) outside the field of play and tap it back in, I knew I was out."
The 2017 update to the laws included a provision for boundaries and "airborne fielders". Lord's, home of the MCC who act as cricket's rule makers, tweeted that "Under Law 19.5, the catch is deemed lawful."
The law says: "A boundary will also be given if a fielder in contact with the ball makes contact with any object grounded beyond the boundary, including another fielder." the Lord's tweet explained that "the key moment is when he first touches the ball, which is inside the boundary. He's airborne for his second contact."
"Amazing catch," it said.
Wade was also impressed.