These two users seem to be fighting each other by defacing each others' posts with gibberish -
I'm running out of flags here, but I trust others to reject these edits. It does make me wonder though - why don't repeated edits getting rejected as vandalism (by multiple reviewers), merit some temporary blocking of edit privileges?
I saw lots of similar questions on meta (e.g. this) but they either treat anonymous edits or single attempts. In this case, the users are known (one of them has >600 rep), and we're talking about repeated attempts