Because the Legion's momentum was too fierce, and the three major sects were too powerful, Mo Zhu Mountain couldn't hold out anymore. It had to provoke a bigger, stronger, and more terrifying presence to enter the fray, to balance the other powers, to muddle the waters, and to secure a precious space for survival.
Describing this as 'the fisherman benefits when the snipe and clam grapple with each other' doesn't seem quite appropriate. A more apt description would be 'two tigers fight, and someone else snatches the chestnuts from the fire.'
Li Fan didn't know whether what he did would buy Mo Zhu Mountain some time or hasten the end of everything.
He was also very perplexed, unsure if the choice he made was the right one.
He didn't know whether the dice he cast would win him a slim chance of survival or spell total loss.
But some heartless fellows were quite happy about it.
