Have the Dallas Mavericks destroyed the Heat's Psyche, Confidence with their 4th-quarter comeback?

there was a little over 6 minutes remaining in the game and the Heat were leading by 15-points, and the Mavericks make a miraculous come-back, are the Miami Heat completely doomed because of this? the next 2 games are in Dallas. Overall, would you say the Heat's confidence, psyche, mental toughness is destroyed now?