The Washington Post’s Peter Wallsten reports that the protester who interrupted First Lady Michelle Obama Tuesday night during a fundraising speech was stunned by her response.

“She came right down in my face,” Ellen Sturtz, 56, a lesbian activist explained after the exchange with the First Lady. “I was taken aback.”

According to the White House pool report, Obama left the lectern and approached Sturtz.

“Listen to me or you can take the mic,” the First Lady said. “But I’m leaving. You all decide. You have one choice.”

The fundraiser was held at a private home in Washington, D.C., for the Democratic National Committee.