Final answer:
The weapon mentioned is a pair of guns in a narrative passage, most likely within a story or a novel. The reference to a teacher falling or being pushed out of a window was not mentioned, showing the importance of approaching questions within their given context.
Step-by-step explanation:
The weapon referred to in the question seems to be a pair of guns from a narrative context, possibly a novel or a story. This is suggested by the excerpt provided where a character named Jane experiences a chilling sensation as she grips the handles of the guns. The description conveys a tense moment, possibly foreboding an event where these guns may be used. The narrative does not mention a teacher falling out of a window directly; however, weapons such as guns are indeed capable of causing harm or fatal incidents as implied in the first passage where a character is instructed on how to use the weapon and subsequently goes on a killing spree. In literary analysis, one would examine the symbolic meaning of the guns and their effects on the characters within the story.