Maybe I should be embarrassed to admit this, but I've played more than 150 Heroes of the Storm games as Zeratul and it somehow never occurred to me during those many, many hours spent with the badass StarCraft II assassin that I could save my team from the outermost brink of defeat. Or at least in this way.
See, Zeratul has a so-called "heroic ability" that unlocks at level 10 that conjures up what looks like a large dome of Jell-O, freezing anything — friend or foe — that's trapped inside for a valuable few seconds.
YouTuber and Reddit-er JJ TheMighty used this Jell-O casting move (technically, it's called a "Void Prison", though I prefer to think that Zeratul summon a huge mound of Jell-O is official StarCraft canon) on his own team's core right when it was about to be destroyed by their opposition:
The Void Prison gave his team a window of opportunity they used to destroy the enemy base in turn.
I'm definitely going to have to use this trick next time the health for my team's core drops into the single digits.