Redondo Union didn’t care that Mira Costa’s volleyball team was ranked No. 1 in California. This was their South Bay rival coming to their gym Thursday night, and anything can happen when a team digs deep and doesn’t fear losing. The Sea Hawks (14-2) were aggressive from the outset and came away with a 27-25, 21-25, 25-22, 21-25, 15-13 victory. “Chemistry,” setter Tommy Spalding said about the Sea Hawks’ triumph. He’s one of three players headed to MIT, and all three had big matches. At one point on back-to-back plays, Carter Mirabal had a block and Vaughan Flaherty followed with a kill off an assist from Spalding. Chemistry. JR Boice, a Long Beach State commit, was delivering kills, and Cash Essert’s serving and all-around play kept Mira Costa’s Mateo Fuerbringer looking frustrated. The Sea Hawks’ focus was on Fuerbringer, who came alive in the fifth set with six kills, but Redondo was able to come back from an 11-9 deficit. It was only Mira Costa’s second loss in 25 matches. Redondo Union took over first …