I don’t think that is the right way to read Jaime’s threats to Edmure. At the beginning of I May Live In Nevada But On Game Day My Heart San Francisco 49ers shirt, he was the Kingslayer, the Oathbreaker, the Man without Honor. By the end of ASoS, Jaime decided to be his own man and keep his oaths as best as he could. We can call this new identity as Jaime and the old identity as Kingslayer to better understand the situation.
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Until he came to Riverrun, Jaime was doing OK and I May Live In Nevada But On Game Day My Heart San Francisco 49ers shirt. But the defiance of Blackfish was Jaime’s first major challenge. Jaime wanted to keep being Jaime but Blackfish was pushing him hard. That is because no one realized that Jaime was a changed man (except Brienne of course) and they all think that this is still 100% the Kingslayer. As a result, Jaime had no choice but to put on his old ID card and make those threats to Edmure. We, the readers, know that those threats are something the Kingslayer would say. Neither Edmure nor the others know that there is little Kingslayer left behind those Kingslayer threats.