[Help] Mob Velocity

Every time I try to hit the mob with a stick, it takes to hits to make the mob shoot in the air. All the other things are functioning correctly but the mob being shot in the air. Here's the code.

Code:java

public class InspireMobBoom extends JavaPlugin implements Listener {
 
    @Override
    public void onEnable() {
        Bukkit.getPluginManager().registerEvents(this, this);
    }
 
    @EventHandler
    public void onEntityDamage(EntityDamageByEntityEvent event) {
        if(event.getDamager() instanceof Player && event.getEntity() instanceof Creature) {
            Player player = (Player) event.getDamager();
            final Entity e = event.getEntity();
            if(player.getItemInHand().getType().equals(Material.STICK)) {
                player.sendMessage(ChatColor.DARK_RED + "[" + ChatColor.AQUA + "Mob Blaster" + ChatColor.DARK_RED + "] " + ChatColor.DARK_RED + "Boom!");
                event.getEntity().setVelocity(new Vector(0, 1.35, 0));
                Firework fw = player.getWorld().spawn(player.getLocation(), Firework.class);
                FireworkMeta fwm = fw.getFireworkMeta();
                FireworkEffect effect = FireworkEffect.builder().withColor(Color.GREEN).with(Type.BALL).build();
                fwm.addEffects(effect);
                fwm.setPower(0);
                fw.setFireworkMeta(fwm);
                Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
                    public void run() {
                        Location l = e.getLocation();
                        l.getWorld().createExplosion(l, 1.0f);
                        e.remove();;
                        l.getWorld().playEffect(l,Effect.MOBSPAWNER_FLAMES,31);
                    }
                }, 35);
            }
        }
    }
}

Can someone tell me why the mob takes two hits to shoot into the air and how to fix it? Thanks!