diff --git a/ootw/ootw_cavern.s b/ootw/ootw_cavern.s
index 167b883c..54b5a7ee 100644
--- a/ootw/ootw_cavern.s
+++ b/ootw/ootw_cavern.s
@@ -142,6 +142,42 @@ done_shake:
 	lda	SLUGDEATH
 	beq	still_alive
 
+collapsing:
+	lda     SLUGDEATH_PROGRESS
+        cmp     #18
+        bmi     still_collapsing
+
+really_dead:
+	lda	#$ff
+	sta	GAME_OVER
+	jmp	just_slugs
+
+
+still_collapsing:
+        tax
+
+        lda     collapse_progression,X
+        sta     INL
+        lda     collapse_progression+1,X
+        sta     INH
+
+        lda     PHYSICIST_X
+        sta     XPOS
+        lda     PHYSICIST_Y
+	sec
+	sbc	EARTH_OFFSET
+        sta     YPOS
+
+	jsr	put_sprite
+
+        lda     FRAMEL
+        and     #$1f
+        bne     no_collapse_progress
+
+        inc     SLUGDEATH_PROGRESS
+        inc     SLUGDEATH_PROGRESS
+no_collapse_progress:
+
 
 	jmp	just_slugs
 
@@ -368,6 +404,7 @@ draw_slugs:
 
 
 	; see if attack
+
 	lda	PHYSICIST_X
 	sec
 	sbc	slugg0_x		; -2 to +2
@@ -376,9 +413,16 @@ draw_slugs:
 	and	#$fc
 	bne	no_attack
 attack:
+	; FIXME: make slug stand up if in range
+
+	lda	SLUGDEATH		; don't re-attack if already dead
+	bne	no_attack
+
 	lda	#$1
 	sta	SLUGDEATH
-	; FIXME: make slug stand up
+	lda	#0
+	sta	SLUGDEATH_PROGRESS
+
 
 no_attack:
 	inc	slugg0_gait		; increment slug gait counter
diff --git a/ootw/ootw_sprites.inc b/ootw/ootw_sprites.inc
index e16a681b..9cc6b161 100644
--- a/ootw/ootw_sprites.inc
+++ b/ootw/ootw_sprites.inc
@@ -109,8 +109,10 @@ collapse_progression:
 	.word	collapse3
 	.word	collapse4
 	.word	collapse5
-	.word	collapse5
-	.word	collapse5
+	.word	collapse5	; 6
+	.word	collapse5	; 7
+	.word	collapse5	; 8
+	.word	collapse5	; 9
 
 collapse1:
 	.byte $4,$8
diff --git a/ootw/zp.inc b/ootw/zp.inc
index 66576da7..c174e0ce 100644
--- a/ootw/zp.inc
+++ b/ootw/zp.inc
@@ -165,7 +165,9 @@ DIRECTION	=	$F5
 GAIT		=	$F6
 TENTACLE_X	=	$F7
 TENTACLE_PROGRESS =	$F8
+SLUGDEATH_PROGRESS = 	$F8
 TENTACLE_GRAB	=	$F9
+SLUGDEATH	=	$F9
 TEMP		=	$FA
 TEMPY		=	$FB
 INL		=	$FC