Besides, there were some officials present to bear witness, thus, Rong Yan had no chance to refute. And this was one of the motives to murder.
Secondly, it was his personal affair with Gu Tianqing!
Rong Yi used to flirt and almost managed to molest Gu Tianqing!
Even though Rong Yan came in time, Rong Yi was not afraid of him and even molested Gu Tianqing publicly, which infuriated Rong Yan greatly.
Therefore, this was the second motive for Rong Yan to murder Count Le Hua. Little Si who was serving the latter at the time could also bear witness.
Thirdly, because of the private affair between Rong Yan and Gu Tianqing, they plotted against Gu Xijiu. They wanted her to go to the secret garden of Rong Yi and deliberately ensured people were accusing her for meeting her lover. Fortunately, because of Gu Xijiu's faithfulness and no show, Rong Yan’s plot had failed.
For this incident, the eighth prince, Master Hu and Gu Xijiu could be the witnesses.