"I must be going."
From beginning to end, Grand Priest Son Goku had only aimed to stall Grand Mother and the others. Now, sensing the successful birth of the Savior out in the outside world, their plan was complete, and there was no need to lock horns with Grand Mother to determine a winner.
After Grand Priest Son Goku left, Grand Mother chose not to go and support Zeno and Yamoshi. Her strength fell considerably short of both of them, so if an opponent could not be defeated by Zeno and Yamoshi joining forces, her going would be of no use whatsoever.
Chapter 345