"I didn't know we'd scored nine runs until I went back out to play defense and looked at the scoreboard," Paulsen said. "I thought [Gerardo] Parra hit the homer before [the fifth]."
Parra began the rally with a leadoff homer against Giants starter Matt Cain. The right-hander had cruised through four scoreless innings, allowing one single with six strikeouts.
The homer -- Parra's first at Coors Field -- tied the score at 1. Twelve more batters came to the plate before the inning ended. The Rockies' nine-run inning was the biggest in franchise history against the Giants, who last allowed nine runs on April 7, 2013, against St. Louis in the fourth inning. Six of Colorado's nine runs scored with two outs.
"It was nice to see us keep adding on because the Giants are one of the better come-from-behind teams in the game," manager Walt Weiss said. "They've done it several times this year."
Reynolds followed Parra's homer with his first double of the inning. With one out, catcher Tony Wolters, making his second Major League start, won a 10-pitch encounter with Cain and blooped a single over third base.
Wolters stole the first base of his career despite the Giants pitching out, putting two runners in scoring position for Rockies starter Jorge De La Rosa, whose bloop single to right field made it 3-1.
DJ LeMahieu doubled over the head of right fielder Hunter Pence. Cain loaded the bases by walking Carlos Gonzalez on eight pitches and was lifted after 91. Chris Heston came on to face Nolan Arenado, who lined a two-run double off the wall in left to make it 5-3. After Parra was intentionally walked, Reynolds cleared the bases with his second double of the inning. Paulsen singled to complete the scoring.
The Rockies' eight hits in the inning were also the most in franchise history against the Giants in a single inning.
De La Rosa held the Giants to one single through six innings before faltering in the seventh. But after giving up 15 hits, seven walks and 12 runs in 8 2/3 innings in his first two starts, De La Rosa, who gave up four runs (three earned) in 6 2/3 innings, took a significant step forward.
"I thought he used his fastball better today," Weiss said. "Still had the changeup today, the real good one, but I thought he pitched better with his fastball than he had the previous two outings. That was more like him, and we needed some length out of that start today."