10:32-34 Why were the disciples amazed, and the others who followed Jesus here, afraid?

The disciples were amazed, and the others following - the accompanying crowd - were afraid. Scriptures do not tell us why, but Jesus obviously walked in advance of the disciples with a solemnity and determination which foreboded danger, and His manner struck awe in the minds of the disciples.

It bewildered, perplexed, astonished them.

The meaning of what Jesus had previously told them about how He must suffer and die and be raised up again on the third day, was only just becoming apparent to them, whereas previously, they understood none of it (cp Mt 16:21-23 (also Mk 8:31-33); Mk 9:9-10, 31-32; Lk 9:21-22, 44-45; Lk 18:31-34).

Jesus explains it again to them on the way to Jerusalem, only this time He goes into more detail (cp Mk 10:33-34).