added forgotten protection rune check (thanks to Adadov)

init.lua

@@ -7,7 +7,7 @@ mobs:register_mob("mob_horse:horse", {
 	visual_size = {x = 1.20, y = 1.20},
 	mesh = "mobs_horse.x",
 	collisionbox = {-0.4, -0.01, -0.4, 0.4, 1.25, 0.4},
-	animation = { 
+	animation = {
 		speed_normal = 15,
 		speed_run = 30,
 		stand_start = 25,
@@ -92,6 +92,11 @@ mobs:register_mob("mob_horse:horse", {
 			return
 		end
 
+		-- applying protection rune
+		if mobs:protect(self, clicker) then
+			return
+		end
+
 		-- make sure tamed horse is being clicked by owner only
 		if self.tamed and self.owner == clicker:get_player_name() then