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A hotel maintenance worker says he barely escaped unscathed when Las Vegas shooter Stephen Paddock opened fire down a hallway — and credited a hotel security guard with saving his life.

"When the first shooting started, I was kind of frozen for a second," worker Stephen Schuck said Wednesday on "TODAY." "He yelled at me, 'Take cover! Take cover!' If he yelled a second too late, I would have been shot."

Schuck said he came upon security guard Jesus Campos, who was unarmed and injured in his leg, as Paddock fired more than 200 bullets into the hall and nearby rooms at the beginning of his deadly rampage on Oct. 1. "I am incredibly blessedthat somehow I came out of there alive," Schuck added.

His dramatic account, and the release of audio of those initial shots, comes amid a dispute over the timeline of the events and questions as to how quickly Las Vegas police could have learned about the massacre on an outdoor music festival.

In detailing a revised tick-tock of the shooting, Clark County Sheriff Joe Lombardo told reporters Monday that Campos was alerted to the 32nd floor of the Mandalay Bay Resort and Casino, where an alarm associated with a fire exit door went off.

Related: Vegas Shooter Lived Like a Vampire: 'I Don't Do Sun'

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That was the same floor that Paddock,