Simchas Torah stood out as a special time between R. Yisroel and the Rebbe. On Simchas Torah morning, R. Yisroel would lead Shacharis, and then before hakafos, he would joyously recite kiddush over mashkeh. He would enter with two large trays of cake that his wife had prepared, encouraging everyone to take a bite. Thus began the day of exuberant celebration in 770.
The Rebbe enjoyed R. Yisroel's natural chassidic happiness, and when R. Yisroel was more subdued, the Rebbe would motion to him, seeking an explanation for the change.