premise: A man wearing protective gear grinds down a large metal object.
hypothesis: There is a man working.
explanation_1: Grinds down implies working.
explanation_2: Grinding down a large metal object implies the man is working.
explanation_3: The man is working by grinding down on a large metal object.
premise_logic: exists e1 e2 s1 s2 s3 x1 x2 x3 x4.(a_down(s3) & Manner(e2,s3) & Theme(e2,x3) & Actor(e2,x1) & v_grind(e2) & n_object(x3) & of(x3,x4) & n_metal(x4) & a_large(s2) & Theme(s2,x3) & n_gear(x1) & a_protective(s1) & Theme(s1,x1) & Actor(e1,x1) & v_wear(e1) & of(x1,x2) & n_man(x2))
hypothesis_logic: exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_man(x2))