Build Order

Your Voodoo Lounge should be built before the 7th lumber peon is trained (19/20) so that it can be completed as soon as possible without getting destroyed by the Farseer and his wolves.

Ensure that you build your Voodoo Lounge punctually or you will risk losing it to the Farseer and his feral spirits.

Placement

Buildings should be pushed forward, so that more space is left at the back of the base. This is important to ensure that your units do not get stuck. They need to be able to move freely to escape enemy fire as well as to come out of the base when necessary.

Peons harvesting lumber should also be chopping trees situated closer to the burrows so that they can get to their battle stations fast when the enemy invades.

This will also allow you to repair the burrows as soon as they are under attack – Losing burrows will greatly increase your chances of losing.

How to react?

If your peon scouted a fast tech build, you should try to Windwalk to your opponent's base without letting him see you (this applies to close spawns and small maps). Then you can start destroying his 2nd orc burrow to stall his production of grunts.

If you are spotted, he may send his Farseer back to his base and defend, reducing your capability to slow him down. Many Farseer users tend to build their 2nd orc burrow before they tech to counter this problem.

Farseer users usually scout with their wolves if they are fast teching. As soon as you see a wolf entering your base, cancel your second grunt and build a warmill instead.

The presence of the scouting wolf informs you of the likelihood of a Farseer/Firelord strategy. Note the way the buildings are pushed forward to create space at the back of the base.

Cancel your second grunt so that you can build your Warmill first. The construction of the Warmill should not be delayed.

A fast Warmill will allow you to get a fast watch tower up which is good for deterring your opponent from sending his units deep into your base to destroy Orc Burrows and Demolishers.

As soon as the Warmill is completed, build a Watch Tower. I prefer to build the Watch Tower slightly further back so that it is more difficult to destroy.

Build the Watch Tower about one burrow space behind the burrows.

It is good to rally the peon to a suitable spot so that he can build the tower after the Warmill is completed. This is because you may forget to build it as the peon will automatically harvest lumber and you will not be able to see the Idle Peon icon.

This may delay your Watch Tower and give your opponent time to destroy it before it is completed.

The consequences of not building your tower quickly enough

I recommend training 3 grunts before you hit tier 2. Your Blademaster should try to creep to level 2 before that for his Critical Strike ability. It is very important to have Critical Strike to slay the opponent's Farseer or Firelord. Buying the Boots of Speed is also important for chasing those heroes.

Avoid losing your Orc Burrows as it will delay your Shadow Hunter and Demolishers, giving your opponent more time to construct his towers.