When Takal found out about it, “my reaction at the time was, this was such a weird thing he said, because I’m making something for them right now! And he was developing another horror movie with Shana Feste, ‘Run Sweetheart Run.’ It just seemed like a not particularly thought-out way of articulating something that actually really resonates with me.”

Blum apologized soon after, and again, repeatedly, during a recent phone interview. “It was a stupid thing to say,” he told me. “I am guilty of saying dumb things, and this is one of the dumb things that I’ve said.”

Four months later, Blum approached Takal to direct “Black Christmas.” The 1974 original had inspired countless slasher flicks to come, from John Carpenter’s “Halloween” (the Christmastime setting; seeing the action from the perspective of the killer) to 1979’s “When a Stranger Calls” (the killer’s calls are coming from inside the house). Blumhouse had just scored big with its recent remake of “Halloween,” pulling in over $255 million on a reported $10 million budget. Why not reboot the film that inspired it?

The offer was tempting, but it came with a pretty big caveat. “They said, you can do whatever you want as long as it’s called ‘Black Christmas,’ but it has to come out this December,” she recalled. “This was in March, and there was no script.”

To prepare, Takal watched the original film (“I liked that it wasn’t just about a bunch of sorority women who were bimbos”), and ignored the 2006 reboot. She screened a clip reel of scary movies sent over by Blumhouse, and became a student of the jump scare (in a 2017 Times interview, Blum listed a number of foolproof ones, including “door swings closed, someone is now standing behind you in the room”), and the more difficult and labor-intensive “dread-building scare.”

At the end of the original film, Olivia Hussey stabs her sexist boyfriend to death with a poker, believing he’s the killer, but — surprise! — the real murderer is still very much alive, and eager to kill again. Takal was struck by how much the ending of that film mirrored what was still happening in 2019. “All of these men were being exposed for all the terrible things they had done, like Louis C.K. or Mark Halperin, but then they were coming back into the public sphere,” she said. “I was like, what’s happening? We felt like we had had a victory where women had finally found their voices, and then these men kept popping back up.”