['they', 'see', 'explosion', 'way', 'EmptyParameter']
['<PRP>', 'discover-84', "Synset('sound.n.04')", "Synset('concept.n.01')", 'EmptyParameter']
They will be able to see the explosion all the way back to Earth.
<PRP> will be Synset('able.a.01') to see the Synset('sound.n.04') all the Synset('concept.n.01') back to <LOCATION>4.