Note: Only attempt this technique if they are fluent in the Rank 2 skill 
"Counter" and they have enough Synchronization bars; one and a half rows of bars 
will do. When in battle, equip your hidden blade. With this equipped, all of 
your counters will score an instant kill. You can even instantly kill tougher 
ranked guards (for example, the Teutonic guards in Acre when hunting Sebrand). 
Also, most of the time using the hidden blade in battle will scare the last one 
or two (even three if you are lucky) guards, causing them to run away. However, 
because you do not have a weapon that is sufficient enough to block a full sized 
enemy blade, all incoming attacks will hurt you.
While in battle, if you see a guard you are fighting physically emote in any way 
(for example, taunting you or cowering in fear), press Low Profile Assassinate 
while facing them to score an instant kill without having to counter.