- Fixed: Monster reaction time was always zero with fast monsters and not just on nightmare.

src/g_level.h

@@ -547,6 +547,7 @@ enum ESkillProperty
 	SKILLP_SlowMonsters,
 	SKILLP_Infight,
 	SKILLP_PlayerRespawn,
+	SKILLP_InstantReaction,
 };
 enum EFSkillProperty	// floating point properties
 {
@@ -590,6 +591,7 @@ struct FSkillInfo
 	int RespawnLimit;
 	double Aggressiveness;
 	int SpawnFilter;
+	bool InstantReaction;
 	int ACSReturn;
 	FString MenuName;
 	FString PicName;

src/g_skill.cpp

@@ -79,6 +79,7 @@ void FMapInfoParser::ParseSkill ()
 	skill.RespawnLimit = 0;
 	skill.Aggressiveness = 1.;
 	skill.SpawnFilter = 0;
+	skill.InstantReaction = false;
 	skill.ACSReturn = 0;
 	skill.MustConfirm = false;
 	skill.Shortcut = 0;
@@ -195,6 +196,10 @@ void FMapInfoParser::ParseSkill ()
 				else if (sc.Compare("nightmare")) skill.SpawnFilter |= 16;
 			}
 		}
+		else if (sc.Compare ("InstantReaction"))
+		{
+			skill.InstantReaction = true;
+		}
 		else if (sc.Compare("ACSReturn"))
 		{
 			ParseAssign();
@@ -401,6 +406,9 @@ int G_SkillProperty(ESkillProperty prop)
 
 		case SKILLP_PlayerRespawn:
 			return AllSkills[gameskill].PlayerRespawn;
+
+		case SKILLP_InstantReaction:
+			return AllSkills[gameskill].InstantReaction;
 		}
 	}
 	return 0;
@@ -538,6 +546,7 @@ FSkillInfo &FSkillInfo::operator=(const FSkillInfo &other)
 	RespawnLimit= other.RespawnLimit;
 	Aggressiveness= other.Aggressiveness;
 	SpawnFilter = other.SpawnFilter;
+	InstantReaction = other.InstantReaction;
 	ACSReturn = other.ACSReturn;
 	MenuName = other.MenuName;
 	PicName = other.PicName;

src/p_mobj.cpp

@@ -4503,7 +4503,7 @@ AActor *AActor::StaticSpawn (PClassActor *type, const DVector3 &pos, replace_t a
 
 	FRandom &rng = bglobal.m_Thinking ? pr_botspawnmobj : pr_spawnmobj;
 
-	if (actor->isFast() && actor->flags3 & MF3_ISMONSTER)
+	if (!!G_SkillProperty(SKILLP_InstantReaction) && actor->flags3 & MF3_ISMONSTER)
 		actor->reactiontime = 0;
 
 	if (actor->flags3 & MF3_ISMONSTER)

wadsrc/static/mapinfo/chex.txt

@@ -177,6 +177,7 @@ skill nightmare
 {
 	AmmoFactor = 2
 	FastMonsters
+	InstantReaction
 	DisableCheats
 	RespawnTime = 12
 	SpawnFilter = Nightmare

wadsrc/static/mapinfo/doomcommon.txt

@@ -211,6 +211,7 @@ skill nightmare
 {
 	AmmoFactor = 2
 	FastMonsters
+	InstantReaction
 	DisableCheats
 	RespawnTime = 12
 	SpawnFilter = Nightmare

wadsrc/static/mapinfo/heretic.txt

@@ -309,6 +309,7 @@ skill nightmare
 	AmmoFactor = 1.5
 	DoubleAmmoFactor = 1.5
 	FastMonsters
+	InstantReaction
 	DisableCheats
 	SpawnFilter = Nightmare
 	Name = "$MNU_BLACKPLAGUE"

wadsrc/static/mapinfo/hexen.txt

@@ -455,6 +455,7 @@ skill nightmare
 	AmmoFactor = 1.5
 	DoubleAmmoFactor = 1.5
 	FastMonsters
+	InstantReaction
 	DisableCheats
 	SpawnFilter = Nightmare
 	Name = "$MNU_BLACKPLAGUE"

wadsrc/static/zscript/constants.zs

@@ -1018,6 +1018,7 @@ enum ESkillProperty
 	SKILLP_SlowMonsters,
 	SKILLP_Infight,
 	SKILLP_PlayerRespawn,
+	SKILLP_InstantReaction,
 };
 enum EFSkillProperty	// floating point properties
 {