Sentence:  ... and we have learned not to fire at any of the dinosaurs unless we can keep out of their <WSD>reach</WSD> for at least two minutes after hitting them in the brain or spine, or five minutes after puncturing their hearts&mdash;it takes them so long to die. 
Meaning of the word marked with <WSD> tags:  The ability to reach or touch with the person, a limb, or something held or thrown.