Tynes failed to score four points in the final 4:45 after the Chiefs rallied from a 14-3 halftime deficit for a 16-14 lead.
Four points, obviously, was less than the margin of defeat, so this one falls off Tynes shoulders. Still, his first PAT miss of his rookie season -- the first conversion miss in the league this year -- seemed to jump start a swoon that cost the Chiefs a road win they had to have.
Even then, Kansas City appeared to be in good shape on the next defensive series. Jags quarterback Byron Leftwich was left staggering after a second-down hit for the second time in the game. His next two incompletions showed the effect of those hits, and when Dexter McCleon knocked away the fourth-down throw for Jimmy Smith, the Chiefs began celebrating.
Prematurely, as it turned out.
"I thought the game was over right there," McCleon said. "I said, 'That's it, no more timeouts for them.' But it didn't happen that way. We had to go back out on the field again, and we couldn't make a stop."
The Chiefs' embattled defense, which had played well in the second half after being burned on 6 of 9 third-down conversions in the first half, was sent back on the field because Priest Holmes and the best offensive line in the NFL managed only nine yards on three running plays.
"It's a letdown, especially with our offensive line and myself, not to get the first down," said Holmes, who put the Chiefs on top when he took a desperation flip from Trent Green and ran cross-country for 28 yards and a touchdown at the 4:45 mark. "That's a situation you love to be in because you can seal the win, but we finished a yard short. We let our teammates down."
Leading by two and trying to make Jacksonville score a game-winning touchdown instead of a game-tying field goal, coach Dick Vermeil sent Tynes out for a 42-yard field goal. He missed wide right with 2:16 left.
"I've got a job to do on just a couple of plays a game, and I didn't get it done. I let 52 other guys down today," said Tynes, the rookie kicker who replaced veteran Morten Andersen this season. Tynes hit a 31-yarder in the first half.
Given one last chance from his 33 with no timeouts remaining, Leftwich shredded the Chiefs in general, and McCleon in particular.
The second-year quarterback completed 7 of 8 passes for 67 yards, with four of those throws going over McCleon. The last one went for 14 yards to Cortez Hankton, who entered the game with one catch all year, for the game-winning score with 45 seconds showing.
McCleon disputed the touchdown call. "I didn't think the guy got down in bounds, which is what I tried to tell (the officials)," McCleon said.
But no one was listening. Just as no one may pay any attention to the Chiefs the rest of the year after their debilitating 1-4 start.