Oi, back in my days we have no ducks flying around obbies and there were no permenant platform to support the ground of the boss map. Or maybe there was after 2016... idk. Be lucky you have mounts now :)
C and A usually happen to me, sometimes I get pied, hit by a cannon, fall on the wrong brick I jump on, or get hit by a boo.
A isn't as bad if its losing "A" leg. But if I lose both then I start to worry as when you fall and hit the ground, your body bounces, which makes you slide a bit or you try to jump somewhere while bouncing and it doesn't work.