But after Pierzynski went to re-tag Amarista, who touched home plate before that could happen, manager Bud Black quickly emerged from the dugout to challenge.
"When that play occurred -- and you guys all saw it -- you saw two Major League players react to a play that indicated that a tag was missed," Black said. "You saw their catcher go back and try to tag our runner, because he knew he missed him."
A long review followed before the replay team in New York ruled that the call would stand. Black was quickly ejected for voicing his opinion before the Padres eventually fell, 4-3, at Busch Stadium.
Cardinals manager Mike Matheny felt that had the play not continued after Pierzynski reached for the initial tag, which Davidson had pointed to in making his call, much of the confusion would have been avoided.
"I've been in that position before, too, where it's bang-bang and you feel like you have to [continue]," Matheny said. "There are many times you can just go over and tag him and take away all doubt. I think it just caused a little more confusion."
"When he comes back and goes to retag him, that kind of tells you for sure he didn't tag him," added Grandal. "It's one of those plays [where] you can't do much about it."
The long review suggested umpires were looking for a conclusive view, which never came. Grandal feels, in that sense, that the replay system must continue to evolve.
"If we are going to have the replay, we're going to have to have a lot more cameras, a lot more angles," he said. "It kind of seemed from one angle that he never tagged him. For a catcher to swipe-tag and try to come back and tag the guy, that should tell you something right there."
Alex Halsted is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.