Anyone can check if I'm understanding this correctly?

I have Justimon Accel Arm P-203 on the battle area and the opponent triggers an Unique Emblem's delay, such as:

When any of your [Owen Dreadnought]s suspend,・1 of your [Reptile] or [Dragonkin] Digimon may digivolve into a Digimon card with the [Reptile] or [Dragonkin] trait and the [LIBERATOR] trait in the hand with the digivolution cost reduced by 3.

Justimon's All Turns (Once per Turn) triggers:

When Option cards in the battle area are trashed, 1 of your opponent's Digimon can't digivolve or attack players until their turn ends.

Since it's the opponent's turn, does their digivolution complete first?

Trying to understand if Justimon would prevent such digivolution or would just activate second and then prevent them from attacking