Here's a
video that shows all of the ways you can skip the Crystal Snail miniboss on both BizHawk and Snes9x 1.43.
On BizHawk, it can be skipped using charged speed burner, uncharged speed burner, charged strike chain, charged silk shot, uncharged sonic slicer, or ride armor lunge. On Snes9x 1.43, it can only be skipped with uncharged speed burner, charged strike chain, uncharged sonic slicer, or ride armor lunge (charged silk shot and charged speed burner do not work).
The skip seems to occur when you do 1 or more of 3 things: move through the section near the camera lock trigger more quickly(charged speed burner, charged strike chain, ride armor lunge), cause enough lag through it(uncharged sonic slicer), or create enough sprites while moving through it(uncharged sonic slicer, charged silk shot). I have no idea why charged speed burner and charged silk shot are the only methods that don't work on Snes9x 1.43 when neither of them involve causing lag.