さっする
to sense, to guess
You watch closely enough to work out what has not been said. The same さつ as 警察 sat outside the house, and what he worked out was that he should run: さっする.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.