当换上另一名球员时，球员会冻结在位置上

我有字符代码：

extends CharacterBody3D
@onready var camera_mount = $camera_mount
@onready var animation_player = $visuals/mixamo_base/AnimationPlayer
@onready var visuals = $visuals
@onready var camera_3d = $camera_mount/Camera3D

@export var is_current:bool = true
@export var is_main = true
@export var SPEED = 5.0
@export var JUMP_VELOCITY = 4.5
@export var SENSIVITY = 0.05
var walk_speed = 3.0
var run_speed = 5.0
var is_running = false
var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")

func _ready() -> void:
    if is_main:
        Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _input(event):
    if is_main:
        if event is InputEventMouseMotion:
            rotate_y(deg_to_rad(-event.relative.x*SENSIVITY))
            visuals.rotate_y(deg_to_rad(event.relative.x*SENSIVITY))
            camera_mount.rotate_x(deg_to_rad(-event.relative.y*SENSIVITY))
            

        
func _physics_process(delta):
    if is_main:
        camera_3d.current = is_current

        if not is_on_floor():
            velocity.y -= gravity * delta
        if Input.is_action_pressed("run"):
            SPEED = run_speed
            is_running = true
        else:
            is_running = false
            SPEED = walk_speed
            

        if Input.is_action_just_pressed("ui_accept") and is_on_floor():
            velocity.y = JUMP_VELOCITY
            
        if Input.is_action_just_pressed("ui_cancel"):
            Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)


        var input_dir = Input.get_vector("move_left", "move_right", "move_forward", "move_back")
        
        var direction = (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
        if direction:
            if animation_player.current_animation != "walking" && is_running == false:
                animation_player.play("walking")
                
            if animation_player.current_animation != "running" && is_running:
                animation_player.play("running")
            
                
            visuals.look_at(position+direction)
                
            velocity.x = direction.x * SPEED
            velocity.z = direction.z * SPEED
        else:
            if animation_player.current_animation != "idle":
                animation_player.play("idle")
                
            velocity.x = move_toward(velocity.x, 0, SPEED)
            velocity.z = move_toward(velocity.z, 0, SPEED)
            
        camera_mount.rotation.x = clamp(camera_mount.rotation.x, 
            deg_to_rad(-90), 
            deg_to_rad(70)
        )

        move_and_slide()

负责使用按钮更改游戏中角色的脚本：

extends Node3D

@onready var player_1 = $"../Player1"
@onready var player_2 = $"../Player2"

func _physics_process(_delta):
    if Input.is_action_just_pressed("switch_player"):
        if player_1.is_main:
            player_1.is_main = false
            player_2.is_main = true
            player_2.is_current = true
            player_1.animation_player.play("idle")
        else:
            player_1.is_main = true
            player_2.is_main = false
            player_1.is_current = true
            player_2.animation_player.play("idle")

问题是，如果你在你之前效力的球员在空中时更换球员，那么他就会冻结在这个位置上。我怎样才能做到，一旦我换了一名球员，我之前效力的那个球员就倒地，即开始屈服于物理定律？