Jackson's first response when asked about running along the goal line -
"I try to always do something out of the ordinary. Probably would have dove in from the 12 yard line if I could. Naw but uh, I don't know man, I mean, I knew it was like 12, 13, 14 seconds left in the game and I didn't know if ya know I made it, ya know with time still on the clock so I just wanted to run it along the goal line and um, I knew nobody was gonna catch me and like I said I like to do some things for excitement and that's what the fans and all the crowd, they pay for that, so uh I just wanted to bring that out in them."
While there may have been some element of running the clock out in his mind, it doesn't seem like it was his primary motivation.