What tool saves L.B. Jefferies from harm in Rear Window when confronted by his neighbor?

In Alfred Hitchcock's "Rear Window," L.B. Jefferies employs his camera flashbulb as a critical tool for self-defense during a tense confrontation with his neighbor. The flash of the bulb momentarily blinds the antagonist, providing Jefferies with a crucial advantage to escape the situation.

This moment highlights the theme of observation and the use of tools that reflect Jefferies's profession as a photographer. The flashbulb serves not only as a practical device but also symbolizes his ability to manipulate his surroundings using his skills as a viewer and filmmaker. Through this action, Jefferies's resourcefulness and creativity in problem-solving are emphasized, showcasing the film's intricate interplay between voyeurism and survival.

The other options do not play a significant role in his defense. For instance, a cell phone, which is not a prominent tool in the narrative, would not provide the immediate physical deterrent needed in that moment. Similarly, a lock pick set and verbal warnings are not effective means of protection against the direct physical threat he faces.