A little boy is running down the aisle clutching a book.
Billy was running with his book clutched next to him.
It is implied that Billy is a little boy. "Book clutched next to him" is a rephrasing of "clutching a book."
exists e1 e2 s1 s2 x1 x2 x3.(n_aisle(x2) & for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_clutch(e2) & n_book(x3) & a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_run(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3.(n_male(x1) & n_male(x1) & n_book(x2) & of(x2,x1) & ne_per_billy(x1) & with(e1,x2) & to(e2,x1) & r_next(e2) & Actor(e2,x3) & v_clutch(e2) & (x2 = x3) & Actor(e1,x1) & v_run(e1))