Palmer was intercepted twice for the first time this season and had his fifth-lowest completion percentage. Arians said he felt Palmer's hesitation even on plays he made all season.
"It was a time to trust his feelings," Arians said. "That's one of those things that I know when to stop trying to talk him into a play, because he's not going to do what I want on that play anyway."
Arians, who is the Cardinals' play-caller, errs on the side of overaggressiveness. The Cardinals led the NFL in 20-plus-yard receptions. Palmer threw only four passes that traveled 16 or more yards in the air in 41 attempts last week.
"He picked a lot of shorter completions early instead of going for them like we normally do," Arians said. "I think that was part of 'I don't want to screw this up.' Now that we don't have to worry about that anymore we can go back to being ourselves."
The Seahawks thrived in the second half attacking Carolina's defense downfield and scoring 24 points in 30 minutes.