Xiao Ke actually wanted to speak, he wanted to say the excuses he had prepared earlier, and add some words about how Li Shiming was overbearing and unreasonable. He thought that Elder Zheng would more likely believe him, a True Disciple of the sect.
But he was unable to speak, for within his Spirit Lake, a Sword Intent had emerged.
This Sword Intent was a Thunder Sword Intent, which darted about in the Spirit Lake, occasionally striking the Spirit Lake.
The Spirit Lake is the core of a Foundation Establishment Cultivator, and any problem with the Spirit Lake could damage the foundation of a Foundation Establishment Cultivator. At this time, constantly harassed by the Thunder Sword Intent, he needed all his focus to counteract it.
If he became distracted and spoke, unable to suppress the invasion of the Thunder Sword Intent, he feared his Spirit Lake would be damaged.