(S (S (BASENP (PRP He)) (VP (VP (VBD entered) (BASENP (DT the) (NN building))) (S (VP (TO to) (VP (VP (VP (VB go) (PP (IN onto) (BASENP (DT the) (NN roof)))) (CC and) (VP (VB fire) (BASENP (NN one) (NN shot)))) (PP (IN before) (S (VP (VP (VP (VBG walking) (PRT (RP back))) (ADVP (RB inside))) (CC and) (VP (VBG firing) (BASENP (ADJP (RB several) (JJR more)) (NNS shots))))))))))) (PERIOD .))