Marcus dives into the water and pulls out Cindy. He tells Tremaine that he “could only save one” but them moments later we see Tremaine hauling Ana to Gothel in an attempt to revive her. So…Marcus dove back in and pulled out Ana but yet claims he “could only save one” which implies that one was further away and Ella just happened to be within in his grasp?
That’s how I interpreted it, unless Rapunzel dove in for Anastasia after Marcus came up. They should have explained that better. Also, why didn’t Rapunzel jump in too – why was it just Marcus’ job to save their daughters? Was it just a moment of shock and she didn’t think to jump in as well?