“The campaign script signals a break from the predominantly positive tone Warren and Sanders have adopted throughout the campaign. While Sanders has been critical of other Democratic rivals, particularly Biden, he and Warren, longtime friends, have largely abstained from attacking one another despite regular prodding from reporters.
“The Sanders campaign did not challenge the authenticity of the script, but it declined to comment. The Warren campaign also declined to comment.”
You can tell who feels vulnerable, cuz they always swing first.