BUDAPEST, Hungary (AP) — Andrea Fuentes prevented a tragedy at the swimming world championships with her quick reaction.The United States coach knew something was wrong when she saw artistic swimmer Anita Alvarez sink motionless to the bottom of the pool during a solo free routine on Wednesday.The fully clothed Fuentes dived in. She swam to the unresponsive Alvarez, put her arms around her, and lifted her to the water’s surface, where another person helped get her out of the pool.An artistic swimmer had to be rescued after she sank to the bottom of the pool.