From left: Gildart Jackson (Robert Shaw), Adam Poole (Roy Scheider) and Will Block (Richard Dreyfuss, under table) in Ensemble Theatre Company’s “The Shark Is Broken” at New Vic Theatre (Photo by Jason Niedle/TETHOS) Ian Shaw and Joseph Nixon’s “The Shark Is Broken” — having its West Coast premiere by Ensemble Theatre Company under the direction of Pesha Rudnick in Santa Barbara’s New Vic Theatre — offers an honest, sharply observed behind-the-scenes look at the making of St