Joshua Alston Showtime’s buzzy, bloody drama “Yellowjackets” finds itself in a most precarious position going into its second season. Trying to top a successful first season is always a challenge, particularly when the maiden voyage earns six Emmy nominations, including one for Outstanding Drama. But the inherent pressure to maintain the momentum is acute for “Yellowjackets,” a puzzle-box show that teases supernatural elements. Recent television history is littered with the wreckage of similar shows that started out tense and intriguing, then collapsed once it became clear that the storytellers built an ornately beautiful box but forgot to put anything rewarding inside it. Creators Ashley Lyle and Bart Nickerson, along with showrunner Jonathan Lisco, solved that issue by stuffing their puzzle box to the brim with two harrowing serialized stories. In one story, members of a high school girls’ soccer team survive a plane crash en route to a tournament only to face an unforgiving, wintry wilderness and what could be a malicious supernatural entity pushing them toward madness. In the other story, set 25 years later, the Yellowjackets who survive the woods are freighted with trauma, and desperate to conceal the grave choices they made as kids.