Further to your enquiry I had another brief look at this episode this morning and located the scene to which you refer (occurring ten and a half minutes into the episode, during chapter two).
Clearly Nicholas II was in a highly inebriated, excitable state enjoying the drunken celebrations that he and his friends were having and was incensed to such a degree at the intrusion of the Prefect of the City that led to his sloshing the interloper in the face with the contents of his wine glass. The sudden and violent impact that he caused on the man?s face caused a personal history childhood déjà vu type flashback in the Russian leader whom, clearly from his features, is traumatised by this. The subsequent and very brief archive painting of a man?s face blown apart by a similarly graphic splattering effect was undoubtedly Nicholas II?s grandfather. I believe this is borne out by his conversation in bed, in the next scene, with Ksehessinska where he talks about a (waking) dream he had about the death of his grandfather. As we hear this involved someone throwing a bomb at his carriage in an assassination attempt. From the vividness of his memories he appeared to be nearby at the time and, at the tender age of twelve it had a lasting effect on him not just from the pain of losing a favoured relative but possibly wondering if the same grizzly fate may one day befall him!
The subsequent sequence you refer to, that of his morning meeting with his mother has her saying that she has also rebuked General Wahl (I put on the subtitle option for this!). Clearly she feels that both he and her son have to act responsibly due to the high profile positions the hold.
I hope this helps to clarify things for you!
With best wishes
Sarah
