[AlexanderHowl]

I do not think that you can combine Follow-up with Side Effect, so the ability would be illegal from the rules concerning both modifiers. Follow-up is a penetration modifier and cannot be combined with any other penetration modifiers (Basic, p. 105). Side Effect is a penetration modifier and cannot be combined with any other penetration modifiers other than Armor Divisor (Basic, p. 109). In addition, as noted, mortal conditions are not legal for Side Effect. A legal version could be the following:

Dim Mak (-80%): Affliction 5 (HT-4; All-Out Attack, -25%; Backlash, Coma, Resisted by HT, -125%; Costs FP, -10 FP, -50%; Costs HP, 10 HP, -100%; Coma, +250%; Corruption, -20%; Delay, +20%; Melee Attack, Reach C-1, No Parry, -25%; No Signature, Mundane, +25%; Takes Recharge, 1 hour, -30%) [10]. Notes: The use of this forbidden technique is nearly as dangerous to its user as it is to its victim, as its fell energy seeks to destroy its user as much as it seeks to destroy its victim. Even when successful, repeated use within the same month may result in the death of the user, which is why those who have learned it are loathe to use it accept under the most dire of circumstances.