Darkgroom was wright with this reply, maybe i misunderstood you and confues you, sorry for this.
Pick every unit works the nearly following way:
It picks every unit, one by one, and runs the actions on them. So picked Unit refers to the currently picked unit, which is, because the pick every unit action here got no wait (Which would be fatal for the trigger), in fact all units, except it is stopped by something.
Edit: Ah, now i understand where i made my mistake last time. I meant that the next pause or unpause unit action won't affect the before in the pick every unit event units paused ones, if they are not the inserted value.