ANAHEIM -- It was a second straight frustrating loss after a late rally and the fifth defeat in a row for the Angels, but Friday night’s 5-3 setback against the Mariners at Angel Stadium was punctuated by a mental error from Justin Bour in the eighth inning.

Three batters after Mike Trout tied the game at 3 with a two-run shot off lefty Marco Gonzales, Bour came to the plate with a runner on first base and one out after Albert Pujols drew a walk and was replaced by pinch-runner Brian Goodwin. Bour skyed a popup toward second base but didn’t bother to run to first, so third baseman Ryon Healy, shifted to the second-base side, smartly let it drop and turned an inning-ending double play. Goodwin was running on the play but ran back to first so he couldn’t be doubled off, only to see the Mariners complete the unusual 5-6-3 double play.

“Honestly, there’s really no excuse for it,” Bour said. “It’s embarrassing. That’s something you’re taught from the day you start playing baseball. There’s no excuse for it. That can never happen again.”

Angels manager Brad Ausmus said he didn’t talk to Bour about the costly mistake, as there was no need to because Bour knew what he did wrong.

“That's the type of thing you don't even have to explain,” Ausmus said. “It'll never happen again in his career. It was just an extreme mental error that once it happens, it never occurs. It would be surprising for anyone, quite frankly. You learn that one early on in Little League."

Mariners second baseman Dee Gordon was the one who saw that Bour wasn’t running to first, so he instructed Healy to let the ball drop and start the pivotal double play that shifted the momentum back in the Mariners’ favor.

“Obviously being the guy who was going to catch the ball, I had no idea he was going to do that,” Healy said. “So Dee yelled at me, ‘Let it drop. Let it drop.’ From there, I picked up the ball and looked at first and looked at Dee and said, ‘What do I do now?’ He said, ‘Throw it to second,’ so all of the sudden we had the double play. I jogged off the field not really knowing what happened. I felt like he was just playing ‘MLB The Show’ and just controlled me on a little controller.”

“Really crucial play in the game," Mariners manager Scott Servais said. "They had some momentum going there. That was really all on Dee Gordon. He was yelling at Healy to let the ball drop because he saw Bour didn’t run. It was an awesome, heads-up play by Dee."

Trout’s homer goes to waste

With the offense scuffling through seven innings, Trout made up for it with one swing against Gonzales. Trout, who hadn’t homered since April 7 -- two days before he suffered a strained right groin -- ripped a 2-1 sinker below the zone to left for his sixth blast of the year. It was a no-doubter, as Trout flipped his bat after the two-run shot left his bat with an exit velocity of 109.2 mph and went a projected 428 feet, per Statcast.

But Bour’s gaffe followed and a half-inning later, closer Cody Allen surrendered back-to-back homers to Tim Beckham and Omar Narvaez to suffer his second straight loss after allowing the go-ahead RBI single to Jay Bruce in the ninth inning of Thursday’s 11-10 loss.

“Those are good hitters,” Allen said. “I feel like I've thrown enough innings and faced a lot of those guys enough times to where they kind of know what I'm trying to do. Got a bad count against Beckham. He saw a few breaking balls, then I threw a bad one to him that just backed up and he put a good swing on it. Narvaez, it just kind of ran right down to his sweet spot.”

Before Trout’s homer, the Angels’ only run off Gonzales came in the fourth, when they loaded the bases and Zack Cozart plated Bour with a sacrifice fly to left, only to see Jonathan Lucroy get thrown out trying to advance to third on the throw home.

“We hit some balls hard,” Ausmus said. “I think the one that hurt the most was Trout lining out to shortstop [in the third] and the ball Cozart hit with the bases loaded to left. A little unfortunate, a little lucky in that sense, but the [Mariners] got big hits."