allegedly unstable, possibly ruthless guy
Fixed it for you. If he was unstable he would have been dead ten times by now.
The guy has the patience of a python. Nothing is done on a whim in the heat of the moment. I can give examples, but that would drag off-topic. That also means that anything that looks like an "emotional" reaction is either fabricated by us or we do not see the whole combination and which hand is holding the knife with the poison blade. It may be the white hand not the black one (we can thank Frank Herbert for the reference).
IMHO we have not yet seen the hand with the poison on the blade. Just yet. The combination which started with the DNC hack is yet to complete.