Simple question: between a round of combat can a player use the Unstable Potion to attempt to heal wounds?
If you'll quote the card's text it will make answering easier. A quick google turns up an image of the card which says "You may discard the Potion at the start of your turn..." which means the answer is ostensibly "no," but i'm not sure what version of the game the picture is from, and yours might be worded differently.
We played it this way this afternoon and the result was the hero ended up dead anyways
It's difficult to imagine any other outcome in this game .