Shabbat 4 - Do not confuse a scholar

Rav asked Rabbi Yehudah the Prince (his uncle) a question: if someone loaded a person with food and drink, and then this person carried his load into the street on Shabbat, what is the law? Since this person did not pick up the food, he did not perform the complete carrying on Shabbat, which requires both picking up and then putting it down. Or when he started moving his body, it was akin to picking up, and the person is liable.

Rabbi Yehudah replied, "He is liable." He added, "It is not the same as a hand." Rabbi Yehudah was anticipating a question of why putting it in his hand does not make him liable, but putting it on his shoulder does."

Rabbi Chiya (son of Rabbi Yehudah) addressed himself to Rav, "Son of scholars! When Rabbi Yehudah is teaching another area of law, do not distract him with questions about Shabbat. What if he does answer right? It might prove an embarrassment. Here, however, he answered correctly." His hand, unlike his body, is not at rest. So, it never performs the start of the first part of the Shabbat violation.