Skandalizo: to cause to sin, to scandalize. Does Peter know what he is saying? Though I will scandalize you, I will not scandalize you! The noun form skandalon (stumbling block) is also pregnant with meaning, both in Matthew (cf. 16:23 and 18:7) and in St. Paul (1 Corinthians 1:23-24). It is the Cross of Christ, that becomes the skandalon of history. Perhaps what is going on below the surface of this text is the insistence that while Peter and disciples scandalize Christ in their desertion; Christ scandalizes and redeems the world by his Cross.
Not only is Jesus handed over (paradidomi), he is also disowned and renounced (anarneomai) by his closest friends.