Actually, Gu Hang's original plan was somewhat risky.
Directly pulling Galaraldo's soul into the Storm God Kingdom, if everything went smoothly and was completed in a second, there wouldn't be any problem; but if this guy had any special preparations, any interruption during the pulling would leave traces.
Though Gu Hang would definitely disguise any traces left behind, and it would take a long time for the Empire's official investigation team to arrive, any remnants of subspace energy would eventually dissipate completely.
