"I think it's just a contagious confidence," he said.
Outlaw's dunk with 3:20 left gave the Blazers a 100-89 lead, and James Jones followed up with a 3-pointer to put it away.
The Blazers, who built a 14-point lead early but briefly lost their advantage in the third quarter, had not won five straight since a run last December.
"It's the same thing in all of our victories, we've got a number of guys coming to play. It was no different tonight, we had a lot of guys step up," Roy said.
Golden State, coming off a victory at home over San Antonio on Tuesday night, has won 12 of its previous 15 games. Baron Davis led the Warriors with 23 points and 11 assists.
The Blazers were without LaMarcus Aldridge, the team's leading scorer and rebounder, for the second straight game. Aldridge is day-to-day with plantar fasciitis, a painful foot condition.
Additionally, the Blazers lost forward Martell Webster during the game because of the flu.
Starting guard Monta Ellis did not play for Golden State because of a strained left thigh.
"Definitely not having Monta out there is a big problem," Stephen Jackson said. "We play a lot faster. It slowed us down a lot and we didn't have an extra ball handler out there."
Both teams were playing the second of back-to-back games. The Warriors beat the Spurs 96-84 at home on Tuesday night, while the Blazers won 97-89 at Utah.
"Tonight I thought the guys, even short-handed, really stepped up and showed how they have grown in the last week," Blazers coach Nate McMillan said. "I really think the whole team is getting a feel of what we want to do."
Tied at 22 after the first quarter, the Blazers went on a 20-6 run capped by Jones' 3-pointer and a pair of free throws, to go up 42-28.
Golden State came back to close within 51-46 on Austin Croshere's 3-pointer, and trailed by 54-49 at the half.
The Warriors continued their comeback after the break and narrowed it to 61-60 on Stephen Jackson's steal and dunk. Davis gave Golden State the lead with a 16-foot jumper.
The Blazers regrouped and pulled ahead with a 12-2 run, going up 79-69 after Jones' jumper.
"We were beaten by a better team tonight and that will happen," Warriors coach Don Nelson said. "We didn't play well enough to win and they did."
The Blazers raised their home record to 8-3.
"You come in here and you want to win, you're going to have to take it from us," Jack said. "We're not giving anything away."
The Portland Trail Blazers and the Rose Garden are looking for a corporate partner to buy naming rights for the arena. It is the first time a corporate-naming partnership has been offered at the Rose Garden since it opened in 1995. The team and arena are both affiliates of Vulcan, Inc., which is owned by Microsoft co-founder Paul Allen. ... Stephen Jackson, having an off night from the floor, fouled out with 3:49 left. "I'm still trying to figure out what's considered a foul and what's not a foul," the 7-year veteran said. "I got to read the players' manual. I'm confused right now." ... It was Przybilla's second double-double of the season, and his seventh game with at least 10 rebounds. Przybilla is seeing more playing time in Aldridge's absence.