I'd be inclined to agree, now that I think about it. They discovered the knot, they did not intentionally tie it. When your headphones get knotted in your pocke

I'd be inclined to agree, now that I think about it. They discovered the knot, they did not intentionally tie it. When your headphones get knotted in your pockets, you don't say "I tied my headphones", you say "my headphones got tangled".