Fake!Spider-Woman said she knocked out the Viper when she called her fat, when it was really keeping her cover (one of them, anyway) with the Avengers.
The last issue and the preview of this issue had Luke Cage moaning about his heart. Could the process that gave him his power also "fix" something wrong with his heart? Maybe if Luke ever permanently loses his powers, his heart will give out.
Oh, are we sure that's Carol Danvers? Or rather... "our" Carol Danvers? MS MARVEL #9 and #10 wasn't that long ago.