A child that is dressed as Spiderman is ringing the doorbell.
The child is trick-or-treating.
Though it is the logical assumption, it's not specified that the child was trick-or-treating.
exists e2 e1 x1 x2 x3 x4.(n_doorbell(x4) & ne_org_spiderman(x3) & Theme(e2,x4) & Actor(e2,x1) & v_ring(e2) & as(e1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_child(x1))
exists s1 x1.(n_child(x1) & Theme(s1,x1) & a_trick-or-treating(s1))