Bochy said if Posey weren't a catcher, he might have been OK to remain in the game, but the Giants wanted to be cautious with the 2012 NL MVP and 2010 NL Rookie of the Year.
"Three runs score like that, we call them RTI's, runs thrown in", joked Manager Bruce Bochy in his postgame press conference.
Giants General Manger Bobby Evans said they do not expect Blackburn to remain with the club. Posey got up on his own but exited the game, with Nick Hundley entering to pinch run and stay in the game behind the plate.
The trigger in all this was Walker's first-inning pitch that struck the right-handed Posey in the temple of the head. "There's been a lot of damage to hitters hit in the head". He was coming off a 4-0 win at the Los Angeles Dodgers on Tuesday night, when he pitched eight innings of five-hit ball and struck out five.
"Mark's a beast. I'll take him every day", Moore said. When Walker couldn't handle that throw, Jarrett Parker, who had started the play on first base, raced home on the second error. Alex Pavlovic of NBC Sports Bay Area first reported that Posey would be placed on the DL and that Federowicz is on his way to the Majors.
"It's a scary moment, unsafe moment", Bochy said.
"You always want to get off to a good start", Diamondbacks left-hander Patrick Corbin said. But his 2016 Triple-A season was a step backwards, and other pitchers have moved ahead of him on the depth chart.
Matt Moore restored some of the joy to the Giants' home opener, throwing eight sterling innings and, with a swing of his bat, sparking a comical play that led to three Giants runs.
In the first innings, Arizona pitcher Taijuan Walker sent down a fastball that proved too quick for Posey to catch up with, hitting him flush on the side of the helmet and knocking him to the ground.
"(Ray) gave us a quality outing", Arizona manager Torey Lovullo said.
As KRON 4 reports, coach Bruce Bochy sounded positive after the game, despite the drama of the moment and the potential for a concussion that could put the Giants' undisputed team leader out of commission for weeks, or worse.