The match was interrupted because Sasuke had significantly injured him. Seconds afterwards Gaara passed out. Temari and Kankuro took him and ran, Sasuke chased them for awhile whilst Gaara rested, then he woke up, went Bijuu, and acted like he was Boss.
Gaara tried going Bijuu in the Staduim. That's why he enclosed himself in the Sand dome. When Sasuke pierced through it with Chidori, the ritual was interrupted. Thus resulting in Gaara having nothing left.
It was Sasuke's complete victory.
Read my comment above.
Lol, a superb choice to post that page