I found a bug in Metroid where the Dragon of Norfair spits empty fireballs
you can see its cheeks puff out to spit the fireballs but nothing comes out
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you can see its cheeks puff out to spit the fireballs but nothing comes out
Hope Nintendo will patch this is the next update
Yoshio Sakamoto was already here a few days ago to replace my cartridge
This GameFAQs thread doesn't really shed any light on it, but I'd naïvely guess (take it with a grain of salt) that you're brushing up against the sprite limit.