Odd, sorry to hear about that. Can't say I ever had that happen to me throughout all the testing.
No key is dropped from him, the thread just ends after he is killed, so if you can try your best to kill him before he falls off you'll be good to go.
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i meant his dead body falls off. thing is that picking up the manifesto solves the problem. saw the pillow lmao, but not the manifesto. There is another thing though, I remember when I was in the clown maze, then paused the game and went for dinner. When I came back, I was floating above the maze. It seems to happen everywhere though