from the ninja faq-
--------
1) If the target takes less than 5 steps during the next 5 seconds then they will take (Ninjitsu/9)*(.3+.7*(hiding+stealth)/220) + [tracking bonus] DIRECT damage
2) If the target takes more than 5 steps in the next 5 seconds then they will take (Ninjitsu/3)*(.3+.7*(hiding+stealth)/220) + [tracking bonus] DIRECT damage
TRACKING: If you sucessfully track a target before you deathstrike, the next deathstrike attack will do additional damage as follows. Adds up to 10 damage based on the distance between where the target was standing when you tracked them and where they are standing when you deathstrike them. In addition you will do tracking /10 (rounded down bonus damage)
[Tracking bonus is now capped at 10 + 1/10 skill ]
--------
are you human or elf?
if human you have a base 20 tracking from jack of all trades, if you get someone tracked and stalk them the required distance you'll get +12 damage.
if elf with .1 you'll have a hard time tracking people, but it may be possible. so with .1 if you manage to get someone tracked and stalk them the required distance you'll get +10 damage.
