In Hobbit-III movie, are there any hints of Saruman turning over to the dark side?

I watched the Hobbit-III movie today and I found the fight between Sauron vs Wizards+Elves combo interesting. For one, everyone except Saruman directly fought with Sauron. Saruman just enters the field, and despite Gandalf was in such a bad condition, does not attack Sauron! Was there a hint somewhere that he has already turned a traiter to Sauron? (We don't see him actually do that until LOTR-II movie).

Also, he tries to stop Elrond from pursuing Sauron further, saying "Leave Sauron to me". What to make of that?