premise: A man in a pink shirt is stealing an old couples bike, the possibility he is a loan shark collecting his dues are high.
hypothesis: The couple looks on as their bike gets stolen.
explanation_1: The bike is stolen but it does not state by who or why.
explanation_2: The couple may not looks on, they may not have seen it.
explanation_3: There is no information in sentence one showing where the couple was located. And if the man was "stealing" the bicycle, it would be more logical that he was doing so during a time and in a manner in which he would not be spotted. It is unlikely that the couple would be looking on.
premise_logic: exists e1 p1 s1 s2 s3 x1 x2 x3 x4 x5 x9.(n_due(x9) & of(x9,x5) & n_male(x5) & n_male(x5) & n_possibility(x5) & Theme(s3,x5) & a_high(s3) & exists p2 e2 x6 x7 x8.((x5 = x6) & Theme(e2,x9) & Actor(e2,x8) & v_collect(e2) & (x6 = x8) & n_shark(x6) & of(x6,x7) & n_loan(x7)) & that(x5,p1) & Theme(e1,x3) & Actor(e1,x1) & v_steal(e1) & n_bike(x3) & of(x3,x4) & n_couple(x4) & a_old(s2) & Theme(s2,x3) & in(x1,x2) & n_shirt(x2) & a_pink(s1) & Theme(s1,x2) & n_man(x1))
hypothesis_logic: exists e1 e2 p1 x1 x2 x3.(n_bike(x2) & of(x2,x1) & n_thing(x1) & n_couple(x1) & r_on(e1) & as(e1,x2) & exists e3.(Theme(e3,x3) & v_steal(e3)) & Topic(e2,p1) & Actor(e2,x3) & v_get(e2) & (x2 = x3) & Actor(e1,x1) & v_look(e1))