Why did white resign in this position?

I don't understand why white resigned in this bullet match lichess.org/BQ0TrSVc
This doesn't look like a blunder or mistake to me, what do you think?

Maybe he heard his mom about to walk in and he was pretending to be asleep? Position seems normal.

Haha ok, just making sure!

Not mom but I've faced more than a few "boss is coming sorry" issues :)

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