How to use an “Arrow Storm”

assassins-creed-brotherhood

I have a boatload of assassins now, which gives me 3 "Assassin Bars". I now see an option that says "Assassinate/Arrow Storm", but every time I call the assassins only one shows up and they don't seem to be using arrows or any more powerful. For reference I'm playing on the PC and "T" is the button I'm pressing to call assassins.

Best Answer

Stand near an enemy and then hold the T key (the one that's used to call recruits) until death falls on your enemies.

This video demonstrates it (not on PC):