Balance, dodge, tumble, or move through dangerous terrain without losing ground.
Heavy men die at choke points. Slow men die when the bridge falls. The ones who walk out of the bad situations tend to be the ones who kept moving — through the press, over the debris, under the chain, into the alley the horse couldn’t follow. You can’t fight your way out of everything. Sometimes you just have to be the faster thing.
Nimble is the skill of fluid movement through danger — keeping your feet on bad ground, clearing obstacles without breaking stride, dodging what you can’t block, and making the terrain work for you rather than against you. Make a Nimble (Agility) Trial when your survival depends on how you move rather than how hard you push. For raw physical force, see Might (Brawn); for moving without being seen, see Sneak (Agility).
Examples: crossing a crumbling walkway at speed; rolling clear of falling stonework; slipping through a press of bodies without touching them; putting yourself between a monster and the exit before it knows you moved.