Actually, after winning that teamfight, if the ADC was still alive, you should move on to kill the Baron unless the fight had happened at the bottom part of the bottom lane…
If you had won the teamfight but chose to take the high-ground, once you had taken the enemy inhibitor, the enemy would have just finished respawning or would be back to full health. In this situation, you would be forced to go back to base, and you might even be chased for a short distance till you finally got the chance to recall. Now, the enemies would try to rush to the Baron. How would you know if you would make it even after recalling to try and prevent the enemy from taking the Baron? Also, with your team scattered, it was extremely easy to get picked off by the enemy.
