Dallas is probably cautiously optimistic. On one hand, Luka is not going to play any better and 42 monk's nephew ain't gonna shoot any better, but the lead is only 6. On the other hand, Kyrie took the 1st half off again, so in theory he's still due an explosive stretch of offense.
OKC is probably hella confident that they'll inevitably turn the tide on this seasaw shyt, but they keep on fumbling the key plays to get over the hump, which allows DAL to build a lead again. This will probably be the true test of their experience/readiness in the 2nd half.