Qian Cangyi did this not out of sheer helplessness; his current attack methods couldn't pose a substantial threat to Wu You, which is also the part he has always needed to supplement.
Hell's Movie clearly understood this, so on the way, it gave him the Limb Extension skill as a supplement. With the leader to the the Time Tomb gang, combined with Silver Radiance, he might be able to perform long-range attacks when time is killed.
Evidently, this combination was very effective in the initial stages, forcing Wu You to close the distance to ambush or retreat to dodge. However, now that some other things have happened to Wu You and led to his new growth, the original combination is no longer effective.
Didn't Hell's Movie Club consider this?
