That slowed down footage is interesting but I'm not sure it's working for me after all.
It doesn't look bad, don't get me wrong you did fine...but I guess it's the fact that he still seems to talk fast as well that is throwing me off. JEJ voice simply goes high and emotional in that particular scene so I don't think there's much one can do to calm him down.
Maybe if his movements were not as slow...which it looks like you are going to try next?