Liu Tingruo could meddle with his Thought Link whenever he linked his thoughts to a certain object. Knowing this, he found it difficult to calmly project his thoughts again.
Jiang Shu always believed in Ruo Ma's Research abilities, so when it came to something like this, if Liu Tingruo wanted to harm him, it probably wouldn't be difficult. She might even be able to thoroughly understand the "Thought Link" ability soon, and that became the root of Jiang Shu's unease.
Under normal circumstances, it might not have been so, but after being "deceived" by Liu Tingruo here, Jiang Shu really didn't want to link his thoughts to this time and space again.
Indeed, he could choose the object of his Thought Link, but there was a pattern to it—he could only choose someone he had "met" here.
After meeting Jiang Xiaobao for the second time, he was able to link to Jiang Xiaobao. On his third encounter with "Jiang Shu's corpse," he could wake up as "Jiang Shu" once more.