Flippers
Grayson was extending his flippers as if the seal was asking him to join in the fun with his own. When they came face to face, Grayson, on the other hand, shook the seal’s flippers.
Playing
Grayson seemed to to have been invited to participate in the festivities by the seal, who appeared to be waving his flippers at him. When Grayson and the seal first came face to face, he reached out and shook the seal’s flippers, while the seal did the same.