Atari and connect
After atari and in reply, Black has two cutting points to consider. Here Black connects at one of them with . Black is stronger, certainly. White however has gained a stone at to reinforce . In isolation one can't very well evaluate the exchange /.
There is a place here, though, to introduce some of the techniques of go 'criticism'.
Supposing Black had started with here. That would have been a solid way to play: perhaps unambitious. Then looks possible, but could be queried by stronger players: perhaps heavy. after that looks too tight; such a play is used when liberties matter greatly, but otherwise Black at a or at b do more to develop.
As is explained on the tewari page, more than one type of argument is used under that name. The idea is to isolate anomalous plays or poor exchanges. A point made at how to lie with tewari is that this is much more convincing when one balances imperfect play by one player against perfect-seeming play by the other. Here we aren't quite in that position: one suspects Black's plays give away more, that's all.