The Celtics were trailing the Eastern Conference Finals 3-0 when they awoke on Tuesday.
Now that the score is 3-2, the series is returning to Miami for Saturday's (8:00 ET, TNT) intense Game 6.
In Game 5, the defending Eastern Conference champions came out strong, never fell behind, and survived (again) with a 110-97 victory.
Boston had a lead of at least 15 points the entire second half, but Miami scored four times in a row in the extra period.
Boston has played much more like a No. 2 seed playing a No. 8 seed after three incredible games. Although the Celtics are still down in this series, their recent play has made the seemingly impossible seem much more likely.
"I think once we got ourselves together," Jaylen Brown said following Game 5, "we all looked each other in the eyes and said hey, we're not going out like this."