SMWJailbreak Mod: Ground-Pound

A5 75         LDA $75         ; If player is underwater...
0D F3 13      ORA.W $13F3     ; ...or flying with a P-Balloon...
D0 22         BEQ EndPound    ; ...make sure player isn't pounding
A5 F0         LDA $F0         ; If player is already ground-pounding...
D0 0D         BNE GroundPound ; ...skip to ground-pounding code
A5 72         LDA $72         ; Load "player in air" flag
1A            INC A           ; Increment (to make this comparison shorter)
25 16         AND $16         ; AND with controller data
29 04         AND #$04        ; If player is not pressing down and not in air...
F0 15         BEQ EndPound    ; ...make sure player isn't pounding
64 7D         STZ $7D         ; Stop any current movement upwards
85 F0         STA $F0         ; Store something non-zero into "ground-pounding" flag
:GroundPound
64 7B         STZ $7B         ; Make the player not move horizontally
C6 80         DEC $80         ; Make the player move down
A9 1C         LDA.B #$1C      ; Store the "butt-slide" pose...
8D E0 13      STA.W $13E0     ; ...into player's current pose
A5 72         LDA $72         ; If player is still in the air...
D0 06         BNE EndOfMod    ; ...skip to end of mod
22 BF 86 02   JSR.L $0286BF   ; Cause a Yellow-Yoshi stomp earthquake
:EndPound
64 F0         STZ $F0         ; Player is not ground-pounding anymore
6B            RTL             ; End of mod code