Find the first winning turn
Do not start with the final turn only. The winning route may have existed one or two turns earlier, especially against armor, taunt, or lifegain.
Replay review
How to review missed lethal in Hearthstone
Missed lethal hurts, but it is one of the easiest mistakes to turn into training. The goal is not to prove you played badly. The goal is to name the pattern you missed.
Rebuild visible damage
Write down board damage, hand damage, hero damage, and the enemy health plus armor. Ignore hidden information unless it was already known.
Compare routes
There may be multiple lethal lines. The best route usually spends the fewest uncertain actions and leaves less room for a blocker.
Name the miss
Was it spell damage, a weapon swing, a taunt clear, a buff order, or mana sequencing? Naming the miss makes it easier to catch next time.
Turn reviews into practice
A good helper should convert a missed lethal into a short puzzle: same board, same hand, one clean route. That is the long-term product loop for LethalCue.