How to beat Shadow Demon in lane?
In a side lane the rules change a bit since most support
Shadow Demon's seem to not grab 
Shadow Poison in favour of more 
Soul Catcher and 
Disruption for easier kill potential for their carry. If he is paired with a 
Slardar, you are in a butt load of trouble if he can disrupt you before you can go on him. I personally have trouble against those that are aggressive before I can initiate or those with a good escape, also, landing Soul Catcher is a real bitch if you are near creeps, so keep that in mind.