Because he knew well that the giant net had its majority of energy depleted by the Golden Mountain Seal, by the time it finally headed towards him, the remaining energy wasn't substantial, which resulted in the limited power of the giant net.
Moreover, although the Spirit Technique used by Xie Changyang likely reached the Profound Grade, one grade higher than the Golden Mountain Seal he used.
But Spirit Techniques, this kind of secret technique, its grade isn't the only standard to measure power.
In some cases, the power of some Yellow Grade Spirit Techniques is not necessarily weaker than some Profound Grade Spirit Techniques.
Especially since Xie Changyang's strength was clearly inferior to Lin Tianming's, resulting in too much energy being consumed by the Golden Mountain Seal.
By the time the remaining curtain of light came, it was easily neutralized by Lin Tianming.
