hurry, to throw, to urge
攛 centers on forceful, hurried action: throwing something quickly or urging someone to move faster.
攛 combines 扌 (hand) with 竄, which likely contributes both sound and the idea of rushing or fleeing. The exact historical development is uncertain.
A hand 扌 beside 竄, which looks like a mouse 鼠 scurrying under a roof 宀. Imagine a hand hurling something to urge the mouse to flee faster.
For サン, picture the sun (サン) beating down, making you hurry to throw things into shade before they overheat.