Everything will get explained throughout the season. The chronology of it all is more than a bit confusing at first.

Sweat drenched Lydia with Valack is happening in the "future" until the rest of the story catches up about midway through the season. When Lydia isn't with Valack, (except in Novel Approach) that's happening "now".

Yes, they show the events out of order with little pieces of the 'present' and the bulk of the episodes showing you the events that led up to the 'present'. Its probably one of the better production decisions they made that season.

That's interesting. Thanks.