To show how the world reacts, simply think about the way the PC's move has affected the world and narrate that change in a way that creates new opportunities for the PCs to act. At its softest, you might describe them successfully breaking down a door, then give them a description of the next room and what danger they find there. You could also make the person they're negotiating with present an option for compromise, or have an enemy they just hit attempt to retreat. This is your opportunity to make the world around the PCs feel real and alive.

Description

To show how the world reacts, simply think about the way the PC's move has affected the world and narrate that change in a way that creates new opportunities for the PCs to act. At its softest, you might describe them successfully breaking down a door, then give them a description of the next room and what danger they find there. You could also make the person they're negotiating with present an option for compromise, or have an enemy they just hit attempt to retreat. This is your opportunity to make the world around the PCs feel real and alive.