One enemy you can kill is a target, not a game. You need a lot of them. But there's a wrong way to make a lot of them. You could call new for a fresh enemy every time one spawns, then throw it away when it dies. That is how an arcade game stutters. The garbage collector wakes up in the middle of a fight and drops a frame. So the waves come from a pool instead. You build a fixed set of enemies once. Then you hand them out and take them back, over and over.

A pool to spawn from

Lesson 6 left a single robot in the arena. It was a full set of components you could see and shoot. To get many enemies without that stutter, you don't create them one at a time. You build a fixed set once, when the scene loads, and reuse it. That robot's whole component block becomes the template an EntityPool stamps onto each slot. Open src/scenes/TwinStickArena.json and add the pool to the World entity, next to the BulletPool and Bullet from Lesson 4:

"EntityPool": {
  "pool": "enemy",
  "size": 16,
  "tags": ["enemy"],
  "components": {
    "MeshPrimitive": {
      "primitive": "sphere",
      "diameter": 1.2,
      "segments": 16,
      "material": { "diffuseColor": [0.85, 0.25, 0.35], "emissiveColor": [0.255, 0.075, 0.105] }
    },
    "Enemy": {
      "arenaHalfWidth": 19,
      "arenaHalfDepth": 19,
      "wanderSpeed": 1.8,
      "wanderInterval": 2,
      "walkClip": "Walking",
      "attackClip": "Punch",
      "attackRangeHysteresis": 1.6,
      "fallBackClips": ["Shot_and_Blown_Back", "Walking_Blow_Back"],
      "fallForwardClips": ["Fall_Forward"]
    },
    "LineOfSight": {
      "targetTag": "player",
      "fov": 220,
      "range": 32,
      "rayCount": 3,
      "blockRadius": 0.6,
      "interval": 1.5
    },
    "Health": { "hp": 2, "maxHp": 2 },
    "Shadow": { "castShadow": true, "receiveShadow": false },
    "Mesh": {
      "src": "/shooter-shooter-bot-1/shooter-bot-1.glb",
      "instanced": true,
      "follow": true,
      "faceMode": "proxy",
      "scale": 1,
      "yawOffset": 0,
      "position": [0, 0, 0],
      "autoLoad": true,
      "lockRootMotion": true
    },
    "SkeletonAnimator": {}
  }
},

size: 16 builds sixteen enemy slots the moment the scene loads. All sixteen wait offstage, and none are live yet. tags: ['enemy'] is the tag set that every reused slot resets back to. components is the set for each enemy. You write it just like a scene entity's components map. The MeshPrimitive sphere is the collision proxy the pool moves around. The Mesh and SkeletonAnimator ride on it as the GLB visual.