Then he made a harsh sound in his throat, and with a violent thrusting
movement of his powerful arms pushed his way through.
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Tom's physical actions are aggressive and determined: standing "on tiptoes," peering, making a "harsh sound in his throat," and using a "violent thrusting movement of his powerful arms" to push through the crowd. This emphasizes his physical dominance, his privileged sense of entitlement to access the scene, and his urgent need to see/confirm what has happened. The "harsh sound" suggests visceral shock or disgust catching in his throat.