These people are demonstrating for their leader.
A doctor takes someone's blood pressure in a clinic.
When a doctor takes blood pressure he is not demonstrating for a leader.
exists e1 x1 x2.(n_leader(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & for(e1,x2) & Actor(e1,x1) & v_demonstrate(e1))
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & in(x3,x5) & n_clinic(x5) & n_pressure(x3) & of(x3,x4) & n_blood(x4) & of(x3,x2) & n_person(x2) & n_doctor(x1))