I had to read the rule for myself...Ballard's try was a good one but not a touch down.
Goal Lines
ARTICLE 2. The goal line at each end of the field of play runs between the
sidelines and is part of the vertical plane that separates the end zone from
the field of play. This plane extends beyond the sidelines (Exception: Rule
4-2-4-e <span style="color: rgb(255, 0, 0);">(pasted below)</span>). The two goal lines are 100 yards apart. The entire goal line is in the
end zone. A team’s goal line is that which it is defending (A.R. 2-11-2-I).
4-2-4-e
e. When a ball carrier dives or jumps toward the sideline and is airborne as
he crosses the sideline, forward progress is determined by the position
of the ball as it crosses the sideline (A.R. 8-2-1-III and IV).
Goal Lines
ARTICLE 2. The goal line at each end of the field of play runs between the
sidelines and is part of the vertical plane that separates the end zone from
the field of play. This plane extends beyond the sidelines (Exception: Rule
4-2-4-e <span style="color: rgb(255, 0, 0);">(pasted below)</span>). The two goal lines are 100 yards apart. The entire goal line is in the
end zone. A team’s goal line is that which it is defending (A.R. 2-11-2-I).
4-2-4-e
e. When a ball carrier dives or jumps toward the sideline and is airborne as
he crosses the sideline, forward progress is determined by the position
of the ball as it crosses the sideline (A.R. 8-2-1-III and IV).