diff --git a/chapter-4/example-2-first-monster/monster.js b/chapter-4/example-2-first-monster/monster.js
index ade636d..f5a0868 100644
--- a/chapter-4/example-2-first-monster/monster.js
+++ b/chapter-4/example-2-first-monster/monster.js
@@ -6,6 +6,7 @@ export default class BasicMonster {
         this.x = x
         this.y = y
         this.tile = 26
+        this.moving = false
         dungeon.initializeEntity(this)
     }
 
@@ -17,7 +18,7 @@ export default class BasicMonster {
         let oldX = this.x
         let oldY = this.y
     
-        if (this.movementPoints > 0) {
+        if (this.movementPoints > 0 && !this.moving) {
             // https://github.com/qiao/PathFinding.js
             let pX = dungeon.player.x
             let pY = dungeon.player.y
@@ -36,4 +37,4 @@ export default class BasicMonster {
     over() {
         return this.movementPoints == 0 && !this.moving
     }
-}
\ No newline at end of file
+}
diff --git a/chapter-4/example-3-basic-combat/monster.js b/chapter-4/example-3-basic-combat/monster.js
index 313629d..b4f20d2 100644
--- a/chapter-4/example-3-basic-combat/monster.js
+++ b/chapter-4/example-3-basic-combat/monster.js
@@ -9,6 +9,7 @@ export default class BasicMonster {
         this.x = x
         this.y = y
         this.tile = 26
+        this.moving = false
         dungeon.initializeEntity(this)
     }
 
@@ -32,7 +33,7 @@ export default class BasicMonster {
         let finder = new PF.AStarFinder()
         let path = finder.findPath(oldX, oldY, pX, pY, grid)
 
-        if (this.movementPoints > 0) {
+        if (this.movementPoints > 0 && !this.moving) {
             if (path.length > 2) {
                 dungeon.moveEntityTo(this, path[1][0], path[1][1])
             }
@@ -56,4 +57,4 @@ export default class BasicMonster {
     onDestroy() {
         console.log(`${this.name} was killed`)
     }
-}
\ No newline at end of file
+}