If you’re puzzled when you hear Sleepy Hollow‘s Ichabod Crane call Abigail Mills “Leftenant,” you’re in good company.

The first time star Tom Mison used the term on set, “I called cut,” EP/director Len Wiseman says in this exclusive video.

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Wiseman soon learned that the pronunciation of “lieutenant” is correct for Crane’s era. Or, as Mison cheekily notes, “It’s just English… It’s one of those weird things we do.”

Press PLAY on the clip below to hear Wiseman, Mison and co-star Nicole Beharie discuss the moniker, which has become Ichabod’s nickname for Abbie… er, Miss Mills. (We wouldn’t want to be too forward.)

Sleepy Hollow returns with new episodes on Monday, Nov. 4 (Fox, 9/8c).