Make Player respawn if he moves -2 from his last y pos

Hi there I am coding an jump and run module for my Lobby System. but i want, the JNR to end, if he falls 2 blocks down from his last block. I dont want to use a coordinate, because it takes to long to fall.
This is my current code:

Code:

package de.ahmet.lobbysystem.listener;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.Material;
import org.bukkit.Sound;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

import de.ahmet.lobbysystem.Lobby;
import org.bukkit.scheduler.BukkitScheduler;
import org.bukkit.scheduler.BukkitTask;


public class JumpAndRunListener implements Listener {
   
    public static ArrayList<Player> jumping = new ArrayList<Player>();
    private Lobby plugin;

    protected int ticks;
    int task;
    public static boolean jnr = false;
   
    ItemStack paper = new ItemStack(Material.PAPER);
    ItemMeta paperM = paper.getItemMeta();
   
    @EventHandler
    public void start(PlayerInteractEvent ev) {
            Player p = ev.getPlayer();
            if(ev.getAction().equals(Action.PHYSICAL));
            if(p.getLocation().getBlock().getType() == Material.IRON_PLATE) {
                if(!jumping.contains(p)) {
                    paperM.setDisplayName("§7Jump §c§labbrechen");
                    paperM.addEnchant(Enchantment.DURABILITY, 1, true);
                    paper.setItemMeta(paperM);
                    p.getInventory().setItem(4, paper);
                    p.sendMessage(Lobby.prefix + "§7Das §eJump and Run §7wurde gestartet.");
                    p.setGameMode(GameMode.SURVIVAL);
                    p.playSound(p.getLocation(), Sound.LEVEL_UP, 1, 1);
                    p.setAllowFlight(false);
                    p.setFlying(false);
                    jumping.add(p);
                } else {
                    return;
                }
        }

        }
    @EventHandler
    public void stop(PlayerInteractEvent ev) {
        Player p = ev.getPlayer();
        if(ev.getAction().equals(Action.PHYSICAL));
        if(p.getLocation().getBlock().getType() == Material.GOLD_PLATE) {
            if(jumping.contains(p)) {
                p.getInventory().remove(paper);
                p.sendMessage(Lobby.prefix + "§7Du hast das §eJump And Run §ageschafft§7.");
                p.performCommand("spawn");
                p.setGameMode(GameMode.ADVENTURE);
                p.playSound(p.getLocation(), Sound.LEVEL_UP, 1, (float)0.5);
                jumping.remove(p);
            } else {
                return;
            }
        }
    }
   
    @EventHandler
    public void onFall(PlayerMoveEvent e) {
        Player p = e.getPlayer();
        if(jumping.contains(p)) {
            if(p.getLocation().getBlockY() <= 66) {
                p.getInventory().remove(paper);
                p.sendMessage(Lobby.prefix + "§7Du hast das §eJump and Run §cvergeigt.");
                p.setGameMode(GameMode.ADVENTURE);
                p.performCommand("spawn");
                p.playSound(p.getLocation(), Sound.ENDERMAN_DEATH, 1, 1);
                jumping.remove(p);
               
            }
           
        }
       
    }
    @EventHandler
    public void onUsePaper(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        if(e.getAction().equals(Action.RIGHT_CLICK_AIR)) {
            if(e.getItem().equals(paper)) {
                p.sendMessage(Lobby.prefix + "§7Du hast das §eJump and Run §7abgebrochen");
                p.playSound(p.getLocation(), Sound.ANVIL_BREAK, 1, 1);
                p.performCommand("spawn");
                p.getInventory().remove(paper);
                jumping.remove(p);
               
            }
        }
       
    }

}