Impulse on before range is determined

Hi

I remember priority was passed at the end of a phase, from those many Enkil Cog/Madness network etiquette questions. How does this work with another phases, such as "before range is determined"?

Does Player A plays all effects first then priority is passed and player B plays all of theirs or priority passes after each one and it goes a-b-a-b-ab until both stop?

On a bigger scope: Can I "hold priority" on Vtes?

Many thanks on advance

Reference for Impluse discussions: www.vekn.net/forum/rules-questions/73625-enkil-cog-madness-network-acting-outside-own-turn#73625

The active player always get the oportunity after a card is played, so if he play a card in before determine ranged step, he get a oportunity to play another before to pass to the other player, if he pass the other player can play a card, if played, the oportunity goes back to active player until both players pass, so no, you cant hold priority on this step