Fantastic.
I must admit, this was as amazing as the first part of the story.
However, it felt rather short, and only a few parts seem very simply tweened, which pales in comparison to most of the rest of your animation.
Also, to SuburbaniteHunter: the vests never worked for the guards because they didn't ever get shot where their vests were.
Also, how do you know they were using bulletproof helmets?
Secondly, even if they were, how would you know that Reuben can't break through it? What's the chances of a kid becoming an ultimate assassin in the first place? Nothing of this story calls for "realism" besides the fact that people are bound to what they can do with their own two hands with no kinetic energy form of any kind (magic, ki, the force, etc)...
Keep up the good work, bring out your continuations faster and make sure they last quite a bit longer.