They changed the rule this year. The goal line no longer extends beyond the pylons, UNLESS the ball carrier either touches the pylon or touches the ground in the endzone before going out of bounds. Ballard did neither, and the ball was outside the pylons when he crossed the plane of the goal. The refs spotted the ball at the 1, and looking at the replay that was a pretty good spot.
http://texastech.scout.com/2/1097350.html
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><b style=""><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";">Goal
Line Plane Extension changed. </span>[/b]</p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";">Now the Goal line plane runs between
the pylons, and includes the entire pylon. The plane no longer exists beyond
the pylons except in two specific cases:<span style=""></span>(a) When a ball carrier touches the pylon, and (b) when the ball carrier
touches the ground in the end zone. </span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";">Examples:<span style=""> </span>Play #1:<span style=""></span>The ball carrier dives for the corner of the end zone, leaping at the
one yard line. The ball - in his possession: (a) touches the pylon; (b) goes
over the top of the pylon; or (c) crosses the goal line inside the pylon. The
player then first touches the ground three yards beyond the goal line out of
bounds.<span style=""> </span>Ruling:<span style=""> </span>Touchdown in all three instances. The
ball broke the plane of the goal line in the player’s possession.<span style=""> </span></span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";"><span style="font-weight: bold;">Play #2: The player heads for the right pylon of the goal line. At the
two yard line he dives or is blocked into the air by an opponent. The ball
– in his right hand – crosses the sideline at the one yd/line and
passes outside the pylon. Then the runner while air born (a) touches the pylon
with his foot or left hand; or (b) first touches the ground three yards beyond
the goal line out of bounds.
Ruling: In (a), Touchdown,
since the plane is extended because the player touched the pylon. In (b), the
plane is NOT extended, because the player did not touch the pylon or the ground
in the end zone. The ball is out of bounds at the one yd/line. No Touchdown.</span></span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";">Play #3:<span style=""> </span>The ball carrier heads for the right pylon of the goal line.
The ball in his right hand crosses the extension of the goal line outside (to
the right of) the pylon. The runner is (a) deemed to have stepped on the goal
line; or (b) deemed to have stepped on the side line inches from the goal
line.<span style=""> </span>Ruling:<span style=""> </span>Touchdown in (a) since the plane
is extended by touching the ground in the end zone.<span style=""> </span>In (b) there is no touchdown because the player did not
touch the pylon nor did he touch the ground in the end zone. The goal line is
NOT extended.<span style=""> </span>The ball is ruled
out of bounds at the point of crossing the side line. </span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";"><span style=""></span>Play #4:<span style=""> </span>The
ball carrier heads for the right pylon of the goal line with the ball in his
right hand.<span style=""> </span>His foot hits the
pylon just before the ball (a) crosses the pylon; or (b) crosses the extension
of the goal line outside the pylon.<span style=""></span>Ruling:<span style=""> </span>(a) and (b) No
touchdown in either case. Because the pylon is out of bounds, the ball is dead
once the runner’s foot hits the pylon. Thus the ball is dead in both cases before
it crosses the goal line or the side line. <span style=""></span></span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman";">Play #5:<span style=""> </span>The ball carrier is hit and his forward progress is stopped
inbounds near the goal line at the side line to his right. When he is stopped,
the ball is in his right hand extended beyond the goal line (a) inside the
pylon; or (b) outside the pylon. Ruling:<span style=""></span>In (a) the ball extended inside the pylon across the goal line creates a
touchdown and the ball is dead at that point.<span style=""> </span>In (b) no part of his body touched the pylon or the ground
in the end zone. In this case the plane is NOT extended for a touchdown. The
ball is dead short of the goal line. </span></p>