A man appears to be sewing some sort of material.
A man is smelting some iron ore.
Smelting iron ore involves the use of heat and sewing material does not.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_appear(e1) & exists e2 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_sew(e2) & of(x2,x3) & n_material(x3) & n_sort(x2)) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_smelt(e1) & n_ore(x2) & of(x2,x3) & n_iron(x3) & n_man(x1))