Note: Only attempt this technique if they are fluent in the Rank 2 skill "Counter"
and they have enough synchronization bars (a.k.a., life 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.