Sentence:  The petty critic in me would say the show could've done a better job of revealing how she <WSD>got the drop on</WSD> the Night King instead of just Deus Ex Arya'ing the situation, but it's a very satisfying moment, so we'll let it pass. 
Meaning of the word marked with <WSD> tags:  To obtain an advantage over another person, by acting before that person.