Elon Musk's former trust and safety chief at X says Musk had 'more emotion behind his decisions' than she expected

• A former exec at X, previously Twitter, says Elon Musk was at times more impulsive than she expected.
• Ella Irwin told NBC News there was "more emotion behind his decisions" than she anticipated.
• Musk's biographer has noted he has a "dark streak." Musk's ex, Grimes, calls it "demon mode."

A former exec at X, previously known as Twitter, says there was at least one element of working with owner Elon Musk that surprised her.