premise: The boy jumps into the blue pool.
hypothesis: The boy jumps into the pool, as his sister follows soon after.
explanation_1: The first sentence makes it seem like he is alone because it doesn't say that his sister is there or that she is following him
explanation_2: A boy who jumps in a pool does not imply his sister follows soon after.
explanation_3: There is no mention of the boy having a sister at all.
premise_logic: exists e1 s1 x1 x2.(n_pool(x2) & a_blue(s1) & Theme(s1,x2) & n_boy(x1) & into(e1,x2) & Actor(e1,x1) & v_jump(e1))
hypothesis_logic: exists e1 p1 x1 x2 x3.(n_sister(x3) & of(x3,x2) & n_male(x2) & n_pool(x2) & n_boy(x1) & exists e2 s1.(r_soon(e2) & a_after(s1) & Manner(e2,s1) & Actor(e2,x3) & v_follow(e2)) & as(e1,p1) & into(e1,x2) & Actor(e1,x1) & v_jump(e1))
premise_sim: exists e1 s1 x1 x2.(v_jump(e1) & n_pool(x2) & n_boy(x1) & into(e1,x2) & a_blue(s1) & Theme(s1,x2) & Actor(e1,x1))
hypothesis_sim: exists e1 p1 x1 x2 x3.(v_jump(e1) & of(x3,x2) & n_sister(x3) & n_pool(x2) & n_male(x2) & n_boy(x1) & into(e1,x2) & exists e2 s1.(v_follow(e2) & r_soon(e2) & a_after(s1) & Manner(e2,s1) & Actor(e2,x3)) & as(e1,p1) & Actor(e1,x1))