But it's still very jarring because it's presented like you know who these two are beyond them being the two 'other guys' in the Ketheric confrontation.
With Gortash, at least, it's possible to get some significant background information on him from Karlach and Florrick (and a little from Wyll and the Guardian). But it's also possible to miss all that. Orin is a very unknown quantity (maybe Durges get more about her in advance?), and that scene is partially intended to help flesh her out, I'm sure.