A rock climber checks his rope before holding on to the next spot on the rock.
A rock climber is on a mountain.
Climbing doesn't imply climbing a mountain.
(-x)
exists p1 x1 x2.(exists x3.(on(x1,x3) & n_mountain(x3)) & n_climber(x1) & of(x1,x2) & n_rock(x2))