The hiker is following a trail uphill.
The person is escalating.
A hiker is a person and if the hiker is following a trail uphill they are escalating.
exists e1 x1 x2 x3.(n_hiker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_follow(e1) & n_uphill(x2) & of(x2,x3) & n_trail(x3))
exists e1 x1.(n_person(x1) & Actor(e1,x1) & v_escalate(e1))