PULLMAN — The mind of Marcellus Pippins of Washington State was racing as he saw the loose football on the turf at Martin Stadium.

He bent down and scooped the ball up, and one thought ran through his brain.

“Run fast, don’t get caught,” Pippins said.

He gave no thought to diving on the football.

“It was me and the touchdown,” said Pippins, who ran 72 yards for the score that helped ignite Washington State’s 56-6 win over Idaho on Saturday in a drizzly rendition of the Battle of the Palouse before 28,447 at Martin Stadium.

Luke Falk threw for 226 yards and three touchdowns as Washington State posted a positive end to a tumultuous week.

James Williams rushed for 126 yards and a touchdown for Washington State (1-2), which won on a wet, windy day when the Air Raid offense was not working very well.

Idaho (1-2) struggled for the second straight week against a Pac-12 team, after losing at No. 8 Washington.

The Vandals have not scored a touchdown against Washington State the past two times the teams have played.

Austin Rehkow kicked a 42-yard field goal as Idaho took a 3-0 lead on its first possession.

Williams ran over from the 2 for a 7-3 lead for the Cougars. The touchdown was set up by a 50-yard completion from Falk to Kyle Sweet.

Nose tackle Robert Barber — one of four WSU players arrested in recent weeks — blocked a 32-yard field-goal attempt by Rehkow and Pippins scooped up the ball and ran 72 yards for a touchdown as Washington State took a 14-3 lead midway through the second quarter.

“Once special teams made a play it was like a chain reaction,” WSU running back Gerard Wicks said.

Idaho quarterback Matt Linehan fumbled on a bootleg, and Robert Taylor recovered for Washington State on Idaho’s 36. Falk threw an 8-yard touchdown pass to Gabe Marks as Washington State built a 21-3 lead late in the second quarter.

Idaho drove all the way to the WSU 1 midway through the third quarter, but had to settle for Rehkow’s 18-yard field goal that cut the Cougars’ lead to 21-6.

Washington State replied with a 90-yard drive that ended on Wicks’ 2-yard scoring run for a 28-6 lead.

Falk threw a 10-yard touchdown pass to Robert Lewis early in the fourth for a 35-6 lead, and the Cougars added three more touchdowns in the fourth.

“There were some plays we worked hard on and didn’t execute,” Idaho coach Paul Petrino said. “We have to do a better job of coaching them and getting them ready to go.

“But give (WSU) credit for stopping them.”

Washington State coach Mike Leach said his players seemed to respond well to a week of hard practices and harsh criticism.

“We seem to have a group that has a tendency to go soft,” Leach said. “We’ve got to be on them all the time.”

Washington State was expected to contend for the Pac-12 North, but opened the season with losses to FCS foe Eastern Washington and Boise State. That prompted Leach this week to rip his Cougars as soft. Leach also complained that Pullman police seemed to be targeting his players, after four were recently arrested in three different incidents, which the police chief has denied.

Leach’s Air Raid pass attack got a bit of a rest, as the Cougars piled up 228 rushing yards and three rushing touchdowns.

Deon Watson was the Vandals’ leading receiver with five catches for 62 yards with Callen Hightower also catching five but for 37 yards. Defensively, Tony Lashley totaled 11 sacks — 10 solo, and Jayshawn Jordan had eight along with an interception. Tueni Lupeamanu had two tackles for losses totaling 13 yards among his four total stops.