You score an additional 25 victory points for every enemy standard bearer that was removed due to the Last Stand rule (see the Command Groups chapter), or was slain in close combat (remember this can only happen once the rest of his unit, except the champion, are dead). If the enemy Battle Standard Bearer is slain under these circumstances, his death instead scores an additional 100 victory points.
For example: A Battle Standard Bearer that cost your opponent 95 points is worth a total of 195 victory points to you under these circumstances (95 victory points for his points cost, and 100 for being the enemy Battle Standard Bearer). Note that if a standard bearer of any kind is killed by a shooting attack, spell or anything else outside of close combat, these extra victory points are not scored (the enemy is assumed to whisk their prized banner away before your troops can get ahold of it).