In Mcn the 'false witnesses' saw the Spirit of Jesus and thought to see a phantasma.
In Mark the 'ignorant witnesses' did fear to see an angel (a young man not more phantasma) and didn't reveal his news (at the same time the unique way of redemption for them).
In Matthew the ignorant witnesses became progressively ''true witnesses'', even if with fatigue.
In Luke the ''true witnesses'' did fear to see a phantasma but after realized (contra Mcn) to see the Risen.
There is a precise trend in action, here. The charge that pagans moved surely against all the early Christians -- to see only a phantasma (the archangel Jesus) via visions, hallucinations, revelations, dreams, etc* -- is now raised from some Christians against other Christians**.
But it did occurred at least 4 gospels (sic!) to transform that negative charge in a positive proof of (Catholic)Christian pride: having seen the Risen Jesus personally.
** Note that Paul didn't accuse never his enemies to preach or to see a mere phantasma, but only to preach a false Gospel and a false Christ.
*a charge that still the pagan Celsus moved against Christians of his time.
From phantasma to Risen Christ, via angel
From phantasma to Risen Christ, via angel
Nihil enim in speciem fallacius est quam prava religio. -Liv. xxxix. 16.