"That's the Trevor, the good Trevor we know," A's catcher Kurt Suzuki said.
"I was probably more nervous than any other start this year, going against the team I played for for six years," Cahill said.
Meanwhile, it was Parker who was responsible for the grand slam -- and an RBI double to Justin Upton three batters prior that the pitcher and his manager believe should have never been. Parker threw a 2-2 changeup to Upton that was perhaps unfairly deemed a ball, and the D-backs outfielder took advantage of his extended time at the plate by driving the next changeup to center field.
"Yeah, I mean, I thought I made a strikeout pitch to [Upton], didn't get the call I wanted," Parker said. "It's one of those pitches that can go either way. It's definitely frustrating. If it goes my way, we move on ... but, obviously, it was a big inning after that."
The frustration mounted for Parker, who intentionally walked Jason Kubel and struck out Paul Goldschmidt before handing Montero a fastball down the middle.
"I think he got a little frustrated, and rightfully so," Suzuki said. "He's in the heat of the moment and gets into the game real hard and gets a little fired up."
"It came down to the Montero at-bat," manager Bob Melvin said. "I thought [Parker's] stuff was good, probably a little bit more behind than we've seen him. He just got a little frustrated and then, really, just made one ... that pitch to Montero over the plate."
The fifth marked the final inning for Parker, who exited with 102 pitches to his name after surrendering six runs on eight hits with five walks -- two of them intentional -- and four strikeouts just five days after no-hitting the Rangers for seven innings.
It was also Melvin's last inning, as he was tossed by plate umpire Tim McClelland after the inning ended.
"I was just arguing, yeah," Melvin said. "It doesn't really matter at this point."
A similar answer came when asked about the call on Upton.
"It doesn't make a difference now," he said. "Over the course of the game, there are pitches that either miss or are close or whatever. It goes both ways. You see it one-sided a lot of times."
Added Suzuki: "It is what it is. It's not an easy job. Those borderline ones are going to go either way, some tough calls. Unfortunately, we were on the opposite end of where we wanted to be."
Suzuki helped the A's jump on the board in the second with an RBI double off Cahill. Jonny Gomes' sacrifice fly off former A's hurler Brad Ziegler brought home their second run in the eighth and Jemile Weeks rounded out the scoring with an RBI double in the ninth that proved too little, too late in a reunion Parker pictured slightly differently.
"It's just another team," he said. "They probably have a good idea of me, and I think I battled. One pitch here or there, it's a different outcome, a different game."