Which passage from the Article best supports the idea that Leonardo and Michelangelo weren't friendly even before they worked as rivals on the Florence Council Hall paintings?

The minds behind the pairing thought a rivalry would bring out the best in both artists.
Once, when the two men met in the street, Michelangelo hurled an insult about a bronze horse Leonardo never finished.
For one thing, Leonardo considered painting superior to sculpture. But Michelangelo prized sculpting over painting.
And the differences between their approaches were revealing. Leonardo's drawings and painting detailed brutal warfare. Michelangelo's sketches focused on the moments before a clash.

Once, when the two men met in the street, Michelangelo hurled an insult about a bronze horse Leonardo never finished.