Chasson Randle added 15 points and John Gage came off the bench to score 14, hitting four 3-pointers, in helping Stanford beat California 69-59 Saturday.
"John gave us a huge lift," Powell said. "He gets us going and we feed off his energy."
Powell had a point. Gage entered the game with the Cardinal (11-7, 2-3 Pac-12) down by six. He immediately hit a 3-pointer and sparked a run that gave Stanford the lead for good.
"We've been missing that third guy coming in and getting double digits," Stanford coach Johnny Dawkins said. "John stepped up and found opening in their defense. He can stretch defenses."
Josh Huestis had 12 rebounds to go with nine points for the Cardinal, who had lost three of their previous four.
Allen Crabbe and David Kravish each scored 14 points to lead the Bears (10-7, 2-3), who have lost four of their last six. Justin Cobbs added 13 points.
"Stanford made their free throws and that made it tough on us," Kravish said. "For me it was a frustrating game."
Kravish also had nine rebounds before fouling out with 1:40 remaining.
Crabbe, the Pac-12's leading scorer, probably felt the same way. He was held to six points under his season average.
"It's nothing new," he said. "I just have to find other ways to get my teammates involved when the ball is not going in"
Crabbe was limited to four shots in the first half, but returned to score 12 of his points following halftime and help the Bears rally.
California drew within 43-42 with 13:20 left to play on a Crabbe jumper but Randle came up with a steal and layup to swing momentum back to the Cardinal, who eventually built a 13-point lead.
"To turn the ball over is one thing, but when it leads to points like that, it's like a knife," California coach Mike Montgomery said. "It was a bad play at a bad time."
Stanford's Aaron Bright, 0 of 6 from the field, sank both his foul shots and has made 26 in a row.
"It's been a while since he's seen the ball go in," Dawkins said. "I told him to keep taking those shots, that they're going to go."
Gage hit one of his three 3-pointers with 7:07 remaining in the first half to put the Cardinal ahead.
Stanford outscored California 20-8 over the final nine minutes of the first half to take 37-29 advantage into halftime.