['drone', 'scare', 'they', 'EmptyParameter', 'EmptyParameter']
['<VESSEL>1', 'amuse-31.1', '<PRP>', 'EmptyParameter', 'EmptyParameter']
He was hunting tree scarabs and that the drone was scaring them.
<PRP> was Synset('sport.n.01') Synset('tree.n.03') Synset('scarabaeid_beetle.n.01') and that the <VESSEL>1 was scaring <PRP>.