To use a small reflective surface of some kind to direct light from the sun (or another suitable source) into another persons eyes causing them irritation. Similar to how the character Count Olaf burns down houses using his room of mirrors and gigantic magnifying glass in the series of novels A Series of Unfortunate Events written by Daniel Handler, pen name Lemony Snicket.
Nick: What are you doing?
Justin: I am using the screen of this iPad to snicket the teacher. She has no idea where it's coming from.
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