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SpellBound,
As Rigeld2 pointed out, a sequence of events can all be occurring at a single point in the time line. The most common example of this is a Shooting Sequence, which goes out of it's way to state that every shot is fired simultaneously. Yet the instructions to resolve a Shooting Attack are also cascading, it would be impossible to Roll To Wound before even knowing the results of the To Hit Rolls, so clearly the resolution is sequential. This causes no problem within the rules, they are independent of time itself, even though it can cause headaches in people whom try to rationalize it using our understanding of time: A before B means A can not occur during B, only... they do. It is a big ball of wibbily wobbly timey wimey... Stuff.

Maybe I should stop posting when half asleep and ill, while at work still, cause I am a little less serious....

Dominion Psyker Power and Instinctive Behaviour test : Dominion is a blessing, so it manifests at the start of the Psyker’s Movement phase and lasts until the end of the following turn (pg 69 of BRB). Instinctive Behaviour tests must be taken at the beginning of the Tyranid player (don’t have the page, cause it’s a ebook). So, is a unit more than 12”and less than 18” in synapse range of a synapse creature that casted Dominion in its previous turn? The Dominion expires before or after the Instinctive Behaviour test?
If it expires before (because it lasts until the end of the opponent turn), it is only useful to regroup units that are falling back in the opponent’s turn. You can’t count with it for keeping your synapse network.
If it expires after the Instinctive Behaviour test, the text should be ‘it lasts until the beginning of your next Movement Phase.

lsmassa wrote:
Dominion Psyker Power and Instinctive Behaviour test : Dominion is a blessing, so it manifests at the start of the Psyker’s Movement phase and lasts until the end of the following turn (pg 69 of BRB). Instinctive Behaviour tests must be taken at the beginning of the Tyranid player (don’t have the page, cause it’s a ebook). So, is a unit more than 12”and less than 18” in synapse range of a synapse creature that casted Dominion in its previous turn? The Dominion expires before or after the Instinctive Behaviour test?
If it expires before (because it lasts until the end of the opponent turn), it is only useful to regroup units that are falling back in the opponent’s turn. You can’t count with it for keeping your synapse network.
If it expires after the Instinctive Behaviour test, the text should be ‘it lasts until the beginning of your next Movement Phase.

It's irrelevant when it expires.

You test for IB at the beginning of your movement phase.
You cast Dominion at the beginning of your movement phase.

Since they're simultaneous actions, you decide the order. Cast Dominion and then your Synapse range for determining IB is 18" not 12".