It is a pose in which you grab your chest while sitting, and you are grabbed.
The person who is being grabbed feels like he is about to stand up from a sitting position.
腰掛けた状態で胸ぐらを掴む、掴まれるポーズです。
掴まれている方は座った状態から立ち上がりかけている感じになってます。
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