Lin Hai had chosen to make contact with the Mind Stone only after careful consideration.
Among the Infinity Stones, the Mind Stone was the absolute ruler of the mental dimension. Beyond the ability Loki had already demonstrated—to peer into and control the thoughts and dreams of any living being—it could also greatly strengthen the mental power of whoever touched or used it.
It could even grant self-awareness to inorganic entities. Vision in the movies was one product of this property.
Those were precisely the two points Lin Hai had his eye on. His physical strength would continue to grow through the natural circulation of Life Force, while Life Force itself could steadily improve through daily cultivation and the occasional recharge at Ego's Flower Bud.
But when it came to mental power, he had never found an opportunity that could bring about a leap forward. It was not that his mental strength had not improved, but every improvement had been indirect, slow, and passive.
In the Marvel Universe, the specific situations in which coming into contact with Infinity Stones could be dangerous were roughly as follows:
The user's constitution was not strong enough to withstand the Stone's energy impact;
Touching an activated Stone with bare hands, especially without any buffering medium;
Touching multiple Stones at once, causing their energies to stack and instantly exceed the user's limit;
Using a Stone to release its power at high intensity, such as snapping one's fingers.
Lin Hai's current situation did not overlap with any of those dangerous conditions. Under the long-term effects of Life Force, his physique had long surpassed the bounds of normal humanity, and his regenerative ability had reached an absurd level.
He was not touching the Mind Stone itself with his bare hands, nor was he touching multiple Stones at once.