But a few minutes later, Moore walked up the tunnel behind the Broncos sideline -- which is usually the sign that the injury is something more than a momentary concern.
"He was just suddenly gone," said cornerback Chris Harris, Jr.
In the hours that followed Moore's departure, his affliction was worse than could have been envisioned: compartment syndrome, an affliction that threatens limb and life if not properly -- and immediately -- treated.
Moore went to the sideline right after Jamaal Charles' 35-yard sprint to the left side. A handful of tweets immediately after the play criticized the angle that Moore took on the play. That's one of the downsides of the immediate-reaction culture of today; no one watching could possibly have known what Moore was enduring at that moment.
"I knew there had to be something wrong with him when Charles busted through on that long run and he didn't have the acceleration to go make the tackle," said Harris. "Usually he would make the tackle and it would be over. But for Jamaal Charles to get the corner like that, I knew something was wrong with him."
What did reveal itself in that moment was an unusual lack of speed from the typically swift safety; he got turned so fast and was so quickly out of the play that something had to be wrong; it was completely unlike his play against the run this season. It is possible the circumstances of the moment might have been a blessing, as quick diagnosis is crucial to treatment of compartment syndrome.
Moore's prognosis is drastically improved by the immediate identification of the problem; according to the National Institute of Health, "the outlook is excellent for recovery of the muscles and nerves inside the compartment" with "prompt diagnosis and treatment." Had the condition been undiagnosed and allowed to persist, Moore would have been at risk of permanent damage to muscles and nerves -- and perhaps worse.
But as Moore struggled, the Broncos had to go on.
"Being able to have a guy like Mike that can step in (whether) Duke is out or Rahim is out, is big," Harris said.
The argument can be made that no area of the Broncos roster has better depth than the secondary.
There are limits to the depth. Denver has one more experienced backup safety in special-teams captain
"I've never been on a team where everybody (in the secondary) plays. It's a really unique thing," said Harris.
And Moore's injury is just another blow for a Broncos starting lineup that has been more battered than it was in 2012.
Last year, Broncos starters lost 34 man-games. This year's total will be at least 32, since left tackle