four friends cheerfully jumping off the flight stairs.
The four people are happy to get off the stairs.
They are not necessarily happy about getting off he stairs. They could be excited about getting off their flight.
exists e1 s1 s2 x1 x2 x3.(n_stair(x2) & of(x2,x3) & n_flight(x3) & a_cheerfully(s2) & Manner(e1,s2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_friend(x1) & card_eq_4(x1))
exists p1 s1 x1 x2.(n_stair(x2) & n_people(x1) & card_eq_4(x1) & Topic(s1,p1) & Actor(s1,x1) & a_happy(s1) & exists e1 s2.(a_off(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_get(e1)))