User blog comment:SomeoneYouUsedToKnow/SYUTK's V5E11 - Being Weiss Is Suffering - Impressions/Recap/@comment-26018514-20180104034439/@comment-25936766-20180104153506

1) Except Vernal wasn't with Raven, Vernal was with Cinder. They all stepped out of the same portal, remember? There was no way for her to get Vernal in without also getting Cinder and co. in. And if she summoned everyone before Qrow and co. got there, it ruins the idea of an ambush.

And in any case there's still Hazel and the White Fang.

2) You bet, but in the end you're just betting. Nothing says the Vault's there.

And why do you think they wouldn't stop Vernal? What they want is the Maiden, not Raven herself. They don't care if Raven dies or if she abandons them or whatever as long as they still have the Spring Maiden and get the Relic.

So if the Spring Maiden is trying to escape, they would definitely try to stop her, she is literally the key to the Relic, she can't leave before they get it.