But if you think about it, like a picture on the wall, the left and right walls are gone, they are just moving on the back wall, just like a picture on the wall, so in sense you would have to say he broke the second wall (there is the wall behind the picture and the "wall" in front of the picture in which the audience views it)..... so just saying he should have broken the 2nd wall, but then a lot of people wouldn't have got it...lol.
The fourth wall refers to the invisible barrier between the audience and the media. The third wall references the invisible barrier between the author and his creation. When actors talk to the audience, they break the fourth wall. When an author appears in their own work, they break the third wall.