Mm, I thought that might be what's up, but had no clue how J actually works xD Thanks! Even without the mapping wrinkle, though, this is definitely a deviation

Mm, I thought that might be what's up, but had no clue how J actually works xD Thanks! Even without the mapping wrinkle, though, this is definitely a deviation from the examples the article provides: instead of unsquaring the vector we initially squared, we unsquare the sum.