A person wearing Rollerblades slides along a handrail.
A person wearing ice skates slides down a handrail.
If one is wearing ice skates, they have a single metal blade, which are used on ice, not handrails. Whereas, roller blades have 4 separate wheels, and are not the same.
exists e2 e1 x1 x2 x3 x4.(ne_org_rollerblades(x3) & along(e2,x4) & n_handrail(x4) & Actor(e2,x1) & v_slide(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & (x1 = x2) & n_person(x1))
exists e2 e1 s1 x1 x2 x3 x4 x5.(a_down(s1) & Manner(e2,s1) & Theme(e2,x5) & Actor(e2,x1) & v_slide(e2) & n_handrail(x5) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_skate(x3) & of(x3,x4) & n_ice(x4) & (x1 = x2) & n_person(x1))