Breaking and Entering doesn't necessarily involve damage. The "breaking" of the threshold of a residence is what the breaking refers to. You can accomplish this by simply pushing on an unlocked door and by entering you have committed the B and E. The issues of "force" when committing the breaking part is very loose and doesn't always involve a whole lot. Where it gets tricky is when it involves intent. You can be charged with a more serious crime if the purpose of the B and E was to commit another act like theft, vandalism, rape etc. Then it goes from a simple misdemeanor to a felony. All this varies from jurisdiction to jurisdiction of course but most states, where no intent is shown, classify B and E as a statutory misdemeanor.
Wall should have known better but kids are kids and considering a girl was with them...I can say I had a similar situation when I was in high school but mine was for trespassing. They woke my parents up at 2:00 in the morning to come and get me and my car. I had to go in front of a judge and explain what I was doing at 2:00 in the morning with a group of girls on private property (the property being the gravel parking lot of a power station) and a 100 hours of community service later I had the charge dismissed.
And if I'm wrong, don't blame me. Blame my lawyer wife.