“Peter did not know
What to say.
They were terrified.”
οὐ γὰρ ᾔδει τί ἀποκριθῇ· ἔκφοβοι γὰρ ἐγένοντο.
This unique saying of Mark seems like it should be after the voice from heaven. However, it is here. Mark said the Peter was speechless, since he did not know what to say (οὐ γὰρ ᾔδει τί ἀποκριθῇ). He, John, and James were greatly terrified (ἔκφοβοι γὰρ ἐγένοντο).