The first clues are likely to come from the starting XIs.
For Liverpool, the key is usually intensity: fast recoveries, runners beyond the ball and sustained pressure around the box. Atletico, by contrast, tend to make knockout ties feel smaller, narrower and more uncomfortable.
This is the kind of European tie that can turn on one phase rather than one moment.
That contrast is why live score updates can be misleading without context. A dominant spell for Liverpool does not always mean control; a quiet spell for Atletico does not always mean they are out of the game.
On feel, Liverpool appear to have the home-side advantage if they can keep the pace high and avoid frustration. But Atletico Madrid have long made a habit of dragging big opponents into awkward nights. A narrow Liverpool win looks the likeliest outcome, though a low-scoring draw would not be a surprise.
As the night unfolds, the next storyline to watch is simple: whether the early line-up decisions produce pressure from Liverpool or the kind of cagey contest Atletico Madrid usually welcome.