“Then in the house,
Asked him again
About this matter.”
καὶ εἰς τὴν οἰκίαν πάλιν οἱ μαθηταὶ περὶ τούτου ἐπηρώτων αὐτόν.
There is something similar to this in Matthew, chapter 19:10, but it is a wider discussion. Mark said that when the disciples were in the house again (καὶ εἰς τὴν οἰκίαν πάλιν), they asked Jesus further about this matter (οἱ μαθηταὶ περὶ τούτου ἐπηρώτων αὐτόν). As usual, the disciples of Jesus were not quick to understand what he was saying.