If two instances of this sprite are close to each other, and one explodes, the other mysteriously teleports to Mario, possibly leading to a glitch where he's stuck in "kick a Koopa shell" mode and racks up lives somehow. And unlike other bugged sprites I was using in my hack (the Atomic Shroom and Fire Snake), I was stumped on how to fix this!
The only reason I even downloaded this to begin with was because imamelia et al's "custom Bullet Bill cannon" demanded custom sprites by default, and I was using one of the cannons as a base for my own Bob-Omb shooter. A few other levels in my hack used the already-stunned Bob-Omb as an obstacle, but I think I can do without...
Tested with: Lunar Magic 3.02; SA-1 v1.31; snes9x v1.58
Wow, this... this is really up to the detail. Great job with this. I admire the work at disassembling every sprite state, you don't get to see that commonly in older disassemblies.