A 2-2 series tilts sharply back in favor of the higher seed. Since the start of the 2-2-1-1-1 format in 1984 the home court team has won a series tied 2-2 about 76% of the time.
By comparison a lower seed UP 3-1 has went on to win their series about 90% of the time. So this loss was a HUGE swing for Dallas.
You got to figure Denver and OKC are now favorites in their series. The once exception may be to favor Ind over NYK since the Knicks are so injured and tired right now.