If creature B is grappling creature A, then creature C grapples creature B, can creature C move creature B at half movement as per grappling rules on PHB 195? If so, would that automatically break the B-A grapple or would A be grappled as well?
This came up in a game where the Druid turned into a giant squid, grappled an enemy, and then a Roc grappled and pulled the Druid off the boat. DM played it that the enemy was pulled up into the air with the Roc→giant squid combo to humorous results, but I was wondering about the actual ruling.