The Rockets fell 3-1 behind in their playoff series on Sunday, after they lost out 123-120 in overtime at the Moda Center on Sunday.
"We feel like just as easily as it's 1-3, we could be up 3-1," Parsons told reporters after the game.
"A couple of plays here and there, it can all change. We fully expect to come back here (for Game 6). This is it -- win or go home. We're not trying to go home."
The teams will meet for their Game Five encounter in Houston on Wednesday.