Three.js - Collision detection on imported models

[pipd0un]

I'm trying to make a turn based rpg scene with 3d models. I got glTF exports from blender and their animations from mixamo.

I've a constructor like; 

constructor() {

        this.clock = new THREE.Clock();
        this.scene = new THREE.Scene();
        this.loader = new THREE.GLTFLoader();

        this.mixer;
        this.mixerEn;

        this.fog = false;

        this.animations = ["Idle", "Kick", "Stun"];
        this.animationsEn = ["IdleSaf", "HitSaf"];

        this.actions = [];
        this.actionsEn = [];

        this.init();
        this.animate();
    }

then loaded models and their animations;

loadModels() {
        // main model
        this.loader.load('glb/Es.glb', (object) => {

            this.mixer = new THREE.AnimationMixer(object.scene);
            object.scene.position.set(-250,0,0);
            object.scene.rotation.y = Math.PI / 2;

            if (object.scene.isMesh) {
                object.scene.castShadow = true;
                object.scene.receiveShadow = false;
            }

            this.scene.add(object.scene);
            this.loadAnim();
        });

        //opponent
        this.loader.load('glb/Es.glb', (object) => {

            this.mixerEn = new THREE.AnimationMixer(object.scene);
            object.scene.position.set(250,0,0);
            object.scene.rotation.y = -Math.PI / 2;

            if (object.scene.isMesh) {
                object.scene.castShadow = true;
                object.scene.receiveShadow = false;
            }
            this.scene.add(object.scene);
            this.loadAnimEn();
        });
    }

the problem is main character's kick pass though opponents stomach, want to detect that so I can play a stun or fade animation for opponent. Most of collision methods for basic meshes like sphere and cube. I dont know what to do.