CNN’s Brooke Baldwin was hosting her CNN Newsroom from New York on Thursday – until suddenly she wasn’t. Returning from commercial break, Brianna Keilar, host of 1-2 PM’s CNN Right Now was hosting Baldwin’s program, from Washington.

Speculation ensued. Reporters asked questions. Fake milk cartons were slapped on social media.

Baldwin tweeted:

“Ocular migraine. I get ’em about once a year. And in 20 years of doing live TV…that had never happened on set until today. I suddenly couldn’t see. HUGE props to my girl @brikeilarcnn for hopping in the seat with 2 mins notice. Going home to sit in the dark. Back tomorrow. Xoxo.”

Her tweet: