Jack pressed the injector to Ethan’s neck and the assassin gasped,
This repeated "the assassin" reference to Ethan annoys me for some reason (the why of this is less clear to me than the irritation of the horde of acronyms that require looking up because the author doesn't feel the need to spell them out or explain them, but there it is, nonetheless). She could just use "he/him/his" when it's clearly obvious, as in this sentence, who "the assassin" is, or alternately refer to Ethan by his surname.
