['they', 'open', 'fire', 'EmptyParameter', 'EmptyParameter'] ['they', 'hit', 'wall', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'crane-40.3.2', "Synset('substance.n.01')", 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'hurt-40.8.3-1', "Synset('object.n.01')", 'EmptyParameter', 'EmptyParameter']
They open fire, but hit only the cave walls.
<PRP> open fire, but hit only the Synset('object.n.01').