These people are doing dangerous things.
These people are waiting for the bus.
Waiting for the bus is not considered doing dangerous things.
exists e1 s1 x1 x2.(n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_thing(x2) & a_dangerous(s1) & Theme(s1,x2))
exists e1 x1 x2.(n_bus(x2) & n_people(x1) & for(e1,x2) & Actor(e1,x1) & v_wait(e1))