point at things that explode into flame 
(ROOT (S (VP (NN point) (PP (IN at) (NP (NP (NNS things)) (SBAR (WHNP (WDT that)) (S (VP (VBP explode) (PP (IN into) (NP (NN flame)))))))))))
(ROOT (S (VP (NN ) (PP (IN ) (NP (NP (NNS )) (SBAR (WHNP (WDT )) (S (VP (VBP ) (PP (IN ) (NP (NN )))))))))))