you only have to have one foot out of bounds and the other lifted off the court. Same thing with the lane. You get one foot out and lift the other off the court and Voila! Both feet are out of the lane.

That's what's meant by saying he tapped out. He got one foot out and picked the other one up to reset the clock, but the first time he tapped out he'd already been in the lane for just over 5 seconds.