Theophylact of Ohrid

The disciples fled, for it was impossible for the Self-existent Truth and the prophets to lie.

Commentary on Mark ↗

Bede

Then his disciples, leaving him, all fled. The word of the Lord which he had spoken was fulfilled, that all his disciples would be scandalized in him that very night. For even if, by the crowd permitting to the Lord's request, they fled, as John writes, they nonetheless showed the fear and timidity of their mind, that they were more ready to take refuge in flight than to endure suffering with Christ in confidence.

On the Gospel of Mark ↗