Montoya "went off" after tangling with Stewart during the Ford 400, suggesting that Stewart should be suspended and using several colorful nouns in relation to the two-time champion. Later, after Montoya had his Chevy repaired, he returned the favor, spinning Stewart's car into the inside barrier of the Homestead-Miami Speedway front straight.
My take: Ah, it's the curse of the highly talented to forever be in each other's way.