Elon Musk’s Friday emails to Twitter engineers asking them to come to the office. The mixed messages from Twitter leadership to employees continue as Musk tells engineers to report to headquarters, hours after the company told employees the offices would be closed until Monday.

Musk wants engineers to help him “better understand the Twitter tech stack.”

The mixed messages on returning to the office come after a wave of Twitter employees resigned on Thursday.

After the initial call for engineers to come into the office, he also sent a follow-up encouraging people to fly to San Francisco to present in person. He said, in one of his emails, he would be working late into the night at the company’s headquarters office Friday and again on Saturday morning.

Musk said the point of sharing all this code and meeting with him in the office would be to do “short, technical interviews” that would help him “better understand the Twitter tech stack.”

Musk said those authorized to work remotely could request to speak with him by video. But quixotically he also said, “Only those who cannot get to Twitter HQ or have a family emergency are excused.”

The mixed messages on returning to the office come after a wave of Twitter employees resigned Thursday.

Their new “Chief Twit,” as Musk humorously calls himself, had issued an ultimatum a day earlier telling them they would need to commit to his vision for Twitter 2.0, and agree to work “long hours at high intensity.”