https://www.gamespot.com/articles/red-dead-redemption-2s-new-trailer-details-deadeye/1100-6462171/

The latest trailer for Red Dead Redemption 2 shows off the newly expanded Deadeye system, which comes with some added bells and whistles for outlaws looking to cause trouble.

As opposed to Deadeye in the classic Red Dead Redemption, this new one progresses in stages and lets you access a few different kinds of functions. You can use it to slow time and aim your shots carefully, or you can paint targets to have Arthur automatically squeeze off shots. You can even see critical or weak points on enemies, as evidenced by an X-ray effect. This will come in handy when fighting off human enemies, but the trailer also shows Arthur shooting down a stage coach by targeting an explosive piece.