At the point where Chosen starts, Stan and Nate haven’t met, so they’d both be a little shocked if they met in the Lounge. BC Nate is human, of course, so Stan would be stunned to see a human like him. Nate recognizes Stan, so he’s likely to come close for a look at this smol version. Stan gets a very up close view of those captivating eyes…

Stan would have a lot of confusing feelings.