It'll be Raiden who steps in, as the whole point of his vision at the end of issue 3 and the start of this issue is "Look at all of this shit that's about to go down, go check all of this out, yo".
He straight up says it starts with Cassie, so I assume he'll step in before Frost demolishes her.
There isn't any way Cassie is going to win that fight fair(Frost has a +20-0 record and 13 flawless victories, Cassie can't even beat Jacqui in a fight as shown in the first few pages) and if they dare write it so that she does this comic will lose quite a bit of my respect.