Mularkey lost his cool when officials refused to acknowledge his pleas for a review on Luck's fourth-down TD plunge. Luck appeared to fumble the ball as he crossed the goal line.
All scoring plays are reviewed, so Mularkey couldn't challenge, but he seemingly wanted officials to take a longer look at the scoring play. He whipped his play sheet and headset onto the field, drawing a flag for unsportsmanlike conduct.
"I lost my composure because of it," Mularkey said. "I knew it was going to be reviewed. I certainly thought the review would see what everybody else saw."
Players followed his lead, getting flagged for five more 15-yard penalties. Knighton, center Mike Brewster, safety Dawan Landry, defensive end Andre Branch and receiver Justin Blackmon all drew flags. The Jaguars finished the night with 10 penalties for 115 yards.
"That's not going to be who we are," Mularkey said. "There's no way we're going to be that way. We will not be that type of team. We will be a disciplined team, we'll be a smart team and we will be a physical team. But we will not be that team that's going to have personal fouls. It will stop."
Trailing 17-0, Mularkey wanted to go for it on fourth-and-4, but Gabbert bobbed his head and was flagged for a false start. Mularkey settled for a field goal.
Gabbert completed 18 of 31 passes for 209 yards, with an interception. He left the game in the fourth quarter after re-injuring his left, non-throwing shoulder. He could have returned, but Mularkey decided to keep him on the bench with the score out of hand.
Shorts caught six passes for 105 yards and a touchdown, a 4-yarder from backup Chad Henne. Robinson finished with nine receptions for 77 yards.
"You never want to lose a football game," Gabbart said. "We're pretty ticked off. We just have to keep fighting, keep working at it, and turn it around."
Notes: Colts DT Drake Nevis injured a hand. ... Colts hadn't won four straight since closing the 2010 regular season. ... Jacksonville's previous worst start had been 1-7 in 2003, the first season for former coach Jack Del Rio. ... Jaguars have lost five straight Thursday night games and dropped nine of 10 prime time affairs.