I think the steps under https://ohshitgit.com/#accidental-commit-master are wrong: it reverts the commit on the new branch -NOT on the master. This is because git branch auto checks out the new branch. You need to do
git branch NEWBRANCH
git checkout master
git revert —hard HEAD^
If you want to continue working on the new branch you do
git branch NEWBRANCH
git checkout master
git revert —hard HEAD^
If you want to continue working on the new branch you do
git checkout NEWBRANCH