Sociedad know they won't be able to keep up with Barcelona's form so as much as possible they press and play defensively against the superior Barcelona at the moment which makes Barcelona a little troubled by Sociedad's passive style which is only focused on defense done.
But on the other hand, the match is still long although I like the score now where Sociedad is ahead but it looks like this second half will be more difficult even though the first half now Sociedad is likely to be superior until the final whistle but the challenge is in the second half later whether Sociedad is able or not to withstand the onslaught and scheme that Flick has prepared.
The first half ended with a good result for Sociedad and of course this is a very good thing for them especially with a 1-goal lead now they just have to focus on the second half with the same scheme and hope that their concentration does not break down.
What Sociedad did in the first half was very good where the scheme that only relied on fast counter-attacks that were carried out when the Barcelona players were off guard had a positive impact on them and indeed this was the only way for them at this time facing Barcelona who were very good in dominance problems.
But in this case as you said because now with 1 goal behind, of course Barcelona will try more because after all, Flick is currently in a condition that does maintain momentum so they will try their best to make the result a point for them. I think this should be watched by Sociedad now because seeing from what Flick always does in terms of schemes sometimes they always show unexpected things especially their productivity in the last few matches always looks very good.