looks like a spirometer or nebulizer.......treatment for COPD, emphysema, asthma......
Could that have given him some temporary energy, assuming he was not using it for a malady.
I believe it is uploaded with oxygen, which does energize.
The gunman's brother, Eric Paddock, told Reuters in a series of text messages that Danley was sympathetic in dealing with Paddock's allergy-driven quirks.
Paddock often wore brown cloth gardening gloves to prevent rashes from contact with cleaning chemical residues, the brother wrote.
He was also allergic to many pills and was unable to renew his pilot's license - he had flown planes since he was a teenager - because he could not take the pills needed to reduce his blood pressure. At casinos where he was a regular, he was such a valued customer that staff obliged his requests to wash his room's carpet with plain water.
The reason Mary Lou looks so plain in that picture they keep posting of her is because for him she would not wear perfumes or hair sprays or anything with scents in it because it affected him...
Source: Daily Mail