Playing vs a liniair range from the SB I'd 4bet a bit bigger pre(4,5).

Postflop seems fine vs most opponents,

You let him block bet with less than 1/4 of the pot for a cheap draw. You could even put in a normal bet and it would still be a decent raise

What are you afraid of? What cards could possibly have you beat at this flop? 8? I dont think so. AA,KK? With a raise he'll be more careful on later streets. Also 10NL might as well play KJ like AA

Elusive mark is of course way better than me, still, he plays on a different level. I think at higher limits people do those kind of bets because they read the board and think oh there's not much you can have hit, and also it's limited risk of you improving to beat something like KK, AA. You are also not likely to call that raise with small sc. We want value from worse hands. So lets bet small and also give ourself a chance to bluff cheaply next time

I'm not convinced the general population do this at 10NL
I think it's more "oh i hope he doesnt bet big i want to see next card for my draw cheap. Because if I have big hand i bet big"

"oh yes i hit my draw, lets put all the money in at once"

Sucks, but turn has to be a fold I guess.

If I got to the flop with AA or KK here I am going with those and jamming flop when facing this block bet (if the hand plays out the same way).