Answer:
He jumped at the sudden noise, but no one was behind him. So he kept walking, glancing back over his shoulder to make sure he was alone.
Justice, honesty, courage, empathy
What is the exact question can you be more clear with it
When doing a multimedia presentation, the thing that one might be prepared about in advance in case the equipment failure during presentation is to keep giving the speech and using the chalkboard to provide the visuals. This will keep the people interested in listening without caring about the failed instrument.