His new teammates can't stop talking about him.
Quarterback Carson Palmer noticed the difference right away, explaining to reporters that he could hear Peterson's feet on every play.
"He's putting so much force into the ground with every step," Palmer said, per Josh Weinfuss of ESPN. "With a cut, when he's going to sprint, he's just different.
"He's very unique. He's one of one. He runs so differently and so angry, I guess would be describing it. He runs with so much violence, every run, inside zone, outside zone."
In a single game, Peterson revived his season -- once lost in New Orleans -- and altered what the Cardinals can do on offense. If this magic sticks, Arizona must be taken seriously in the NFC West.