diff --git a/src/dehacked.c b/src/dehacked.c
index 8b60ab61..99d95259 100644
--- a/src/dehacked.c
+++ b/src/dehacked.c
@@ -6704,6 +6704,54 @@ static const char *const STATE_LIST[] = { // array length left dynamic for sanit
 
 	"S_KARMAWHEEL", // Karma player wheels
 
+	// Thunder shield use stuff;
+	"S_KSPARK1",	// Sparkling Radius
+	"S_KSPARK2",
+	"S_KSPARK3",
+	"S_KSPARK4",
+	"S_KSPARK5",
+	"S_KSPARK6",
+	"S_KSPARK7",
+	"S_KSPARK8",
+	"S_KSPARK9",
+	"S_KSPARK10",
+	"S_KSPARK11",
+	"S_KSPARK12",
+	"S_KSPARK13",	// ... that's an awful lot.
+
+	"S_LZIO11",	// Straight lightning bolt
+	"S_LZIO12",
+	"S_LZIO13",
+	"S_LZIO14",
+	"S_LZIO15",
+	"S_LZIO16",
+	"S_LZIO17",
+	"S_LZIO18",
+	"S_LZIO19",
+
+	"S_LZIO21",	// Straight lightning bolt (flipped)
+	"S_LZIO22",
+	"S_LZIO23",
+	"S_LZIO24",
+	"S_LZIO25",
+	"S_LZIO26",
+	"S_LZIO27",
+	"S_LZIO28",
+	"S_LZIO29",
+
+	"S_KLIT1",	// Diagonal lightning. No, it not being straight doesn't make it gay.
+	"S_KLIT2",
+	"S_KLIT3",
+	"S_KLIT4",
+	"S_KLIT5",
+	"S_KLIT6",
+	"S_KLIT7",
+	"S_KLIT8",
+	"S_KLIT9",
+	"S_KLIT10",
+	"S_KLIT11",
+	"S_KLIT12",
+
 #ifdef SEENAMES
 	"S_NAMECHECK",
 #endif
diff --git a/src/info.h b/src/info.h
index cfda742c..d0f4be59 100644
--- a/src/info.h
+++ b/src/info.h
@@ -3557,8 +3557,8 @@ typedef enum state
 
 	S_KARMAWHEEL,
 	
-	// Lightning shield use stuff;
-	S_KSPARK1,	// Sparkling Radius 
+	// Thunder shield use stuff;
+	S_KSPARK1,	// Sparkling Radius
 	S_KSPARK2,
 	S_KSPARK3,
 	S_KSPARK4,
@@ -3571,7 +3571,7 @@ typedef enum state
 	S_KSPARK11,
 	S_KSPARK12,
 	S_KSPARK13,	// ... that's an awful lot.
-	
+
 	S_LZIO11,	// Straight lightning bolt
 	S_LZIO12,
 	S_LZIO13,
@@ -3581,7 +3581,7 @@ typedef enum state
 	S_LZIO17,
 	S_LZIO18,
 	S_LZIO19,
-	
+
 	S_LZIO21,	// Straight lightning bolt (flipped)
 	S_LZIO22,
 	S_LZIO23,
@@ -3591,7 +3591,7 @@ typedef enum state
 	S_LZIO27,
 	S_LZIO28,
 	S_LZIO29,
-	
+
 	S_KLIT1,	// Diagonal lightning. No, it not being straight doesn't make it gay.
 	S_KLIT2,
 	S_KLIT3,
diff --git a/src/p_slopes.c b/src/p_slopes.c
index c516fa97..35d4c423 100644
--- a/src/p_slopes.c
+++ b/src/p_slopes.c
@@ -251,7 +251,7 @@ void P_SpawnSlope_Line(int linenum)
 	UINT8 flags = 0; // Slope flags
 	if (line->flags & ML_NOSONIC)
 		flags |= SL_NOPHYSICS;
-	if (line->flags & ML_NOTAILS)
+	if (!(line->flags & ML_NOTAILS))
 		flags |= SL_NODYNAMIC;
 	if (line->flags & ML_NOKNUX)
 		flags |= SL_ANCHORVERTEX;