Spoiler Alert: This story contains spoilers for Season 2, Episode 10 of “Severance,” streaming now on Apple TV+.

Tramell Tillman was done dancing.

After his “Severance” character, Mr. Milchick, conducted a memorable and oft-memed “Music Dance Experience” in the Apple TV+ show’s first season, he didn’t think it was possible to catch lightning in a bottle again.

But when director and executive producer Ben Stiller pitched him on a marching band sequence in the Season 2 finale, “Cold Harbor,” Tillman saw an opportunity to tap into his roots. “I went to two HBCUs, and one of them was Jackson State University. They housed the Sonic Boom of the South, one of the best marching bands in the country, and I would watch them during my undergrad years with such awe and amazement in the athleticism, the creativity and the passion that these musicians and dancers served with,” he tells Variety.

So,...