[JimMorrison]

Originally Posted by Endoperez

...Note that assassination spells and normal assassins are usually talked separately, because the former are used and the latter aren't. Assassination spells can be sent anywhere, their gem cost/success ratio is better and your enemy can't switch his army to "patrol" to remove the troublemaker.
...
As I said, if you've seen assassins used effectively, more detailed explanation would be appreciated. As you've noticed, most people here don't think that assassins are as bad as you make them to be. Alternatively, you could just start using assassins yourself - most people here wouldn't expect them, so it could end up working really well.

Judging by the other thread, I'm quite certain that he is referring to having remote spells spammed at him repeatedly.