Chubster gained durability and ambient momentum effect at will, tied to consequently loss of mobility. Essentially the slower he moved. the tougher he became, with a similer kinetic dampening field around himself while using his power. This made it difficult for him to receive CPR when he was unconscious.
After the defending capes evacuated following Leviathan's opening attack Chubster was knocked out by a wave sent by the beast. A fellow cape with a shotgun gave him CPR. Eventually the teen-aged villain Skitter took over for the departing shotgun cape, attempting to give him CPR, though she was hampered somewhat.
Hearing that another wave was incoming Skitter tried to move Chubster but proved to be too weak, given a split second to make her decision the villain choose was forced to abandon him in order to flee to safety from the incoming wave, and Chubster was killed.
“Keep going. You might have to go a bit. Photo… sixty or so.”
“Oh. He is a hero?”
“He was. He’s dead.”
“If they were going to force you to join? I’d never stay. I’d never let them mess up my memory of my dad, okay? I couldn’t do that. I believe in what I’m doing.”
“Yes. And you believe I should be joining the American heroes?”
“No. I think you should do what works best for you, and maybe that means you don’t. Maybe it means you do, because that helps you avoid jail or time in the hospital, it gives you a job and a lot of help at a time you need that help.”
“Can I ask? His name?”
“Ben. He was Ben. As a superhero, he went by Chubster.”
“It means fat. A funny sort of fat. He was that sort of guy. To poke fun at himself. And he chose the name because he was frustrated all the good names were already taken.” - Department Sixty Four, PRT Quest thread i p67
↑I was indirectly responsible for the deaths of others. I’d looked at the information on the capes who’d died during Leviathan’s attack and found Chubster, the fat man I’d failed to save. Innumerable others had died because we hadn’t been able to stop Bakuda, giving her the chance to attack the city, killing forty-three people and inflicting horrific injuries on dozens more in the process. When Thomas, the man from the Merchants, had been bleeding to death, I’d given the order to leave him there to die. - Excerpt from Plague 12.5