The two techniques that might be used to imply that something terrible has happened offscreen are:
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A reaction shot showing onlookers’ expressions immediately after the event - This technique allows the audience to infer that something significant and possibly terrible has occurred based on the reactions of those witnessing it.
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A swell of dramatic music - Dramatic music can set the tone and indicate that something serious or distressing has happened, even if the event itself is not shown on screen.
So the correct answers are:
- a reaction shot showing onlookers’ expressions immediately after the event
- a swell of dramatic music