To make matters worse, Keenum underthrew his intended target Lance Kendricks, gifting a game-clinching interception to Lions safety Rafael Bush.
Last week, Slay intercepted a late Carson Wentz pass to clinch the win.
Fisher said he apologized to Detroit head coach Jim Caldwell for his players' actions on the final two snaps of the game, when the Lions were in victory formation to run the final 1:01 off the clock. When a team takes a knee, the offensive team tells the refs who relay to the defense that they are doing so.
Keenum completed 27 of 32 passes for 321 yards with three touchdowns, one rushing score and a passer rating of 126.7.
Kendricks scored his first touchdown of the season on a 15-yard pass from Keenum that tied the score, 21-21, in the third quarter. Keenum was so good that even though running back Todd Gurley got going a bit, he became an afterthought for much of the game and had 14 carries for 58 yards.
Gurley failed to score from a yard out on fourth down after Fisher chose to go for it on the final play of the first half with the score 14-14, and the Rams due to receive the second-half kickoff.
The Los Angeles Rams' flight from Detroit to London was a breeze, and the team arrived in England ready to start work for the upcoming week. "We're inside the 1".
"I guess we've got a longer trip", Ogletree said, "trying to figure it out on the flight".
Stafford finished the game 23 of 31 for 270 yards and four touchdowns.
Tate had eight receptions for a career-high 165 yards in Sunday's game. Stafford linked up with his favorite target wide receiver Marvin Jones for the first touchdown of the game.
Keenum couldn't miss against the Lions, though, as he thrived in throwing short, long and intermediate passes, and to several receivers. The ball was jarred loose when Britt hit the turf, he squeezed it between his legs, lost it again and pinned the ball against his shoulder pads on a play that stood after review.
"Our defense has got to play better than that, especially when your offense is starting to click and they're making plays and scoring points", Fisher said. "So I just let them know how I felt about it". "It's all about concentration".
Running back Zach Zenner seemed oddly out of place amongst the Detroit Lions vast array of multimillion-dollar stars on offence.
But Caldwell said today that Tate won't necessarily get the same number of passes thrown to him this week against the Washington Redskins (1 p.m. Sunday, Fox).
The Rams began the day without Robert Quinn and Trumaine Johnson and ended it without Michael Brockers and Lamarcus Joyner.
Los Angeles Rams quarterback Case Keenum (17) walks to the bench as Detroit Lions defensive tackle Tyrunn Walker (93) and teammates celebrate after stopping the Rams at the goal line on fourth down during the first half of an NFL football game, Sunday, Oct. 16, 2016, in Detroit.
"We're very pleased with the offensive output", head coach Jeff Fisher said.
So for the third time in four weeks, Fisher was left answering questions about strategy in his post-game press conference following Sunday's 31-28 loss.