It's also handy for areas with spikes, broken glass, barbed wire, etc. In TR4, you can use either of these for sidestepping. Lara drops to the ground and comes up facing the opposite direction. Also used to put away binoculars or drop a flare without lighting another in TR4. To equip binoculars, choose them from the inventory ring.
Arrow keys look in different directions.
Lara can climb or swim while holding a flare, but she'll drop it when it goes out or she draws weapons. In TR4 Lara can turn around while crouching and holding weapons. Jump Run two steps then jump forward appx. In TR4 Lara can traverse around both convex and concave corners. Jump and grab an overhead surface.