Yes, you were pretty close to it, and if there's no sunflowers planted to stop it, it will slowly spread further. Not fast enough to be of any real concern for a while, but if you find any sunflowers, it would be worth it to go plant one near the edge of the corruption so it doesn't go further.
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(10:17:09 PM) Ed Bellis: i think pac-man just keeps repeating, for instance
(10:17:26 PM) ertyu: ya well tell that to billy michtlle