@EventHandler
public void onEntityDamage(EntityDamageByEntityEvent event) {
	if (event.getEntity().getType().equals(EntityType.PLAYER) && event.getDamager().getType().equals(EntityType.PLAYER)) {
		Player player = (Player)event.getEntity();
		Player damager = (Player)event.getDamager();
		event.setCancelled(true);
    	double damageFinal = event.getFinalDamage();
		
		Bukkit.getScheduler().runTaskAsynchronously(app, () -> {
			double health = player.getHealth() - damageFinal;
			if (health < 0.0) {
				health = 0.1; // Want to keep them alive, ignore
			}
			player.setHealth(health);
		});
		Combat.sendDamageAnim(event.getDamager(), player);
		Combat.applyKnockback(player, damager, 0);
	}
}