Wait... what?

"As they were coming down from the mountain, he charged them not to relate what they had seen to anyone, except when the Son of Man had risen from the dead. So they kept the matter to themselves, questioning what rising from the dead meant." - Mark 9:9-10

It must be getting frustrating for his followers - they see incredibly miraculous events and deeds, and Jesus keeps telling them not to tell anyone else. However, I wonder if, after telling them they could say something after Jesus rises from the dead, his followers did a double-take. Sure they had gotten used to being told to keep things to themselves, but Jesus sneaks in this curveball, seemly without any additional background:

"except when the Son of Man had risen from the dead".

(assumed conversation from his followers)

"Ok, Jesus.

[pause]

Wait, what did you just say?"

And in Jesus' fashion, nothing more was said about that to them - at least at that time.