public static HashMap<Location, Material> blocks = new HashMap<Location, Material>();

@EventHandler
public void onProjecitle(ProjectileHitEvent event){
    if(event.getEntity().getType() == EntityType.ENDER_PEARL){
        Block block = event.getEntity().getLocation().getBlock();
        for (int z = -1; z <= 1; z++) {
            for (int x = -1; x <= 1; x++) {
                for (int y = -1; y <= 1; y++) {
                    final Location loc = block.getRelative(x, y, z).getLocation();
                    if(loc.getBlock().getType() != Material.AIR){
                        Aure.blocks.put(loc.getBlock().getLocation(), block.getType());
                        loc.getBlock().setType(Material.WOOL);
                        Bukkit.getScheduler().runTaskLater(plugin, new Runnable(){
                            @Override
                            public void run() {
                                loc.getBlock().setType(Aure.blocks.get(loc.getBlock().getLocation()));
                            }
                        }, 40L);
                    }
                }
            }
        }
    }
}

Location theRealBlock = event.getEntity().getLocation().substract(0.0D, 1.0D, 0.0D);

event.getEntity().getLocation();

Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable(){

Bukkit.getScheduler().runTaskLater(plugin, new Runnable(){

Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable(){
    public void run(){
        loc.getBlock().setType(Aure.blocks.get(loc)); //no need to use loc.getBlock().getLocation(), same thing as just using loc
    }
}, 40L);