The loss, which produced a season-high losing streak, was so lopsided, in fact, that it provided few insights into how the confident Phillies team that returned from Atlanta on Sunday a season-high two games over .500 could sour so quickly.
Manuel was asked whether the time when he needed to intervene in the clubhouse was drawing near.
"Sometimes when you get beat like that, you don't need to say a whole lot," the manager said. "I think that kind of speaks for itself. I think when you get beat like that, sometimes it should wake you up a little bit.
"And when it comes time to say something, I'll be glad to say it."
Swept by Arizona earlier this week, the Phils began this four-game weekend series with as uncompetitive a performance as they've displayed in this 26-28 season.
Eaton (5-4), who had gone 2-1 with a 2.71 ERA in his last four starts, had less on the ball than Paris Hilton, allowing five runs, six hits and four walks in two innings.
"No excuses," Eaton said.
When the Phillies, shut out for the first time this season, fell behind by 5-0 after two, Manuel yanked his starter, even though that meant the soft underbelly of his bullpen would be exposed for seven innings.
"He kept running deep counts," Manuel explained, "so I thought I'd take him out."
Morris (6-2), who had three of the Giants' 15 hits himself in just six innings of work, permitted just one, a two-out sixth-inning single by Shane Victorino. Carlos Ruiz, with a bleeder single off Steve Kline in the eighth, got the other.
That offensive output came one game after the Phils were held to three hits - one in the first eight innings - against Arizona. If you're counting - and a 4-year-old wouldn't be taxed by this pace - that's five hits in their last 18 innings, a batting average of .086.
"I don't think we're pressing," second baseman Chase Utley said. "We've had some good at-bats and hit the ball hard, to be honest. But we're not really getting results. Sometimes that happens."
By game's end, most of the crowd of 38,164 had abandoned South Philadelphia, and the Phils' infield consisted of Rod Barajas at first, Greg Dobbs at second, Abraham Nuñez at short and Wes Helms at third.
The Phillies were coming off a successful off-day, during which they never fell behind early, fought back, watched their bullpen re-fatten their opponents' lead, or wasted an opportunity to tie the game with baserunning mistakes.
However, once this franchise's latest maddeningly inconsistent season resumed about 7:06 p.m., the pattern that had allowed them to be swept by Arizona began to repeat itself.
Soon, very soon, the optimism that marked the Phils' return from their own road sweep in Atlanta earlier this week had turned as dark and potentially stormy as the menacing evening sky over Citizens Bank Park.
"It seems like we played good in Atlanta," Manuel said. "And we came home here and just haven't played good. We haven't done a whole lot."
After Victorino picked up his National League-leading eighth outfield assist, nailing Randy Winn at the plate with a strong throw to end the first, the Phillies' highlights concluded. San Francisco scored five times off Eaton in the second, three times off Mike Zagurski in the fourth, and added five more off Clay Condrey in the fourth.
The second inning appeared to have ended when Eliezer Alfonzo was picked off second and, on the same play, Morris appeared to bunt at, but miss, a two-strike pitch. But the pitch, which would have been the third out, was ruled a ball.
Manuel barked from the dugout and first-base umpire Tim McClelland ejected him - a blessing for the Phillies manager, as it turned out.
"I felt like he bunted at the ball. . . . I felt like the ball was a strike, too," Manuel said.
Reprieved, Morris singled. Winn walked to fill the bases before Lewis, on what appeared to be a tentative swing, lofted a fly ball that landed softly, just beyond the flowers in left.
That grand slam made it 4-0. It was 5-0 after Bonds lasered a double off the right-center wall to score Mark Sweeney, who also had walked.
Reliever Francisco Rosario left prematurely with a knee bruise, an inning after Morris lined a single off his leg. Zagurski entered, and before the fourth was over the Rubenesque reliever, who was with single-A Clearwater when the season dawned, surrendered a three-run homer to Ray Durham.
"I wasn't in awe," he said. "I just wasn't making my pitches."
Contact staff writer Frank Fitzpatrick at 215-854-5068 or email@example.com.