premise: A little boy watches a Ferris Wheel in motion.
hypothesis: A boy attends a festival with rides.
explanation_1: a boy doesn't have to attend a festival to watch a Ferris Wheel in motion.
explanation_2: In sentence 1 it was not clear if the boy was attending or simply watching.  Sentence 2 also informs us that it is a festival that the boy is attending and that there are rides in addition to simply a Ferris Wheel.
explanation_3: Just because he watches a Ferris Wheel does not mean it is at a festival.
premise_logic: exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_motion(x4) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & ne_org_wheel(x2) & (x2 = x3) & ne_org_ferris(x3) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
hypothesis_logic: exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_attend(e1) & with(x2,x3) & n_ride(x3) & n_festival(x2) & n_boy(x1))