I know trigger priority, but "Strategy 1" is the "start of fight / standby" strategy wich is the lowest in priority and it is the default fighting style when no other trigger activates.
But if "Strategy 5" is "Opponent is rage" it should switch to it immediatly if it is true (In case of Bakruul it is). Also no higher priority (Strategy 2-4) was triggered.
It should have been like this:
>> BAKRUUL SWITCHES TO STRATEGY 1
>> VRAAK SWITCHES TO STRATEGY 1
>> VRAAK SWITCHES TO STRATEGY 5
Instead of waiting one round.
Edit#1: If you set a Opponent is Rage,War, etc. trigger to Priority 5 it should always override "start of fight / standby" as it is always true if you face the specified opponent. So basicly it becomes your "start of fight / standby" for that type of opponent.
Edit#2: I did a few tests in the gauntlet with my speed theathric and he always switches to it after the first attack and before his second one. I don't know if it is intended or not, but it explains Vraak's behaviour.
He only attacked once in the first turn (the blow that got deflected). Then he got grounded and probably lost the rest of his attacks. Then at the start of the second turn before his second attack he switches strategy.