John Gill on Those Who Saw God

Manoah was afraid he should die, but did not fall down as dead; Ezekiel fell upon his face, but had his senses; Daniel's comeliness turned into corruption, and he retained no strength, he fainted, and fell into a deep sleep; see Jdg_13:22; but John fell down at once, as dead. This panic which good men were seized with, at any more than ordinary appearance of God, or apprehension of his presence, arose from a notion that present death ensues a sight of him; hence Jacob wonders, and is thankful, that he had seen God face to face, and yet his life was preserved, Gen_32:30

(Gill)