Otis does the same thing, throwing his toys or marrow bones (read rock hard missiles) way up in the air, over and over again, until he settles down to either chew on it or pass out. It is very cat like in my opinion, at least my three cats I have had through the years used to do that, the cat we have now even does it when she catches a mouse in the chicken coop, throws it into the air like she is playing with it, when it won't move anymore ('cause she done killed it!) she leaves it on our backdoor stoop…thanks!!
That is the one thing, on top of cleaning themselves like cats, that makes B's very cat like. IMO.