Unsportsmanlike (taunting) or not?

[parepat]

Had a situation at our association meeting that sparked some discussion. Player A is five or more yards clear of all B players. When he gets to the goal line he dives into the end zone. Do we automatically have an USC? I know that they have been calling this in college, but the rule refers to delayed, prolonged or excessive acts whereby a player attempts to focus attention upon himself (9-5-1-c). I think the player is attampting to draw attention to himself. However, is this act, on its own, delayed, prolonged or excessive?