An Alternate Explanation
It was the Chinese New Year, a traditional time for the settling of debts and bribes, and not coincidentally the period during which Shi Hou and his compatriots were arrested. A month later, after sending a Chinese employee ashore to reconnoiter the situation, Rees reports that a new official stationed near Yakou “had burnt several houses and destroyed some boats... in consequence of the brokers not coming to terms with him. They have not paid the Mandarines 1/3 of their fees, and several of the brokers have absconded.”
Optional: Looking at the Case Against Shi Hou together with sources from the Jardine-Matheson Archive suggest the possibility of this alternate explanation
Sources: JM B2.7 [Reel 495] No. 131, 2 January 1837; no. 132, 15 January 1837; No. 133, 21 January 1837; No. 140, 28 March 1837.