Hmmm, so it seems likely it was an 'Alexander or Perez have to go situation' - BB couldn't risk any more controversy with an eventual likely explosion, and Perez had already expressed fears for his safety and demanded his lawyer. Might have got very very messy for BB.
Despite Perez being the provocateur, unfortunately Alexander had stepped over the line more than once (language and aggression).
So he cut a deal, was able to leave with his money, BB make a temporary sigh of relief (until the next time!) and their investment in Perez is intact (for now) - ?
Not really BB is it? But then it hasn't been for a long time, especially CBB (Rylan leaving for rehearsals etc).