Re: AFTERMATH
BB-8 is going to roll towards Margo first. He's smart enough to know that if Margo's looking for Rey? Rey will likely be looking for Margo. There'll be worried shrills and beeps because BB-8 didn't see what happened with Rey. He was too busy trying to make sure he escaped from beneath the decks.
Rey struggled with getting from the wreckage to land and once she did make it, she needed time to catch her breath. Though she learned to swim while living in Chicago and Texas, it still isn't one of her best skillsets and it was just a twinge terrifying so she needed to catch her breath and calm down once on land. Eventually, Rey will come out from the other direction of the beach and reconnect with Margo + the others.