Mystic Adepts broken ability, Spell knock out and Unarmed Options

[SHINJO STYLA]

Ok i have a HUMAN mystic adept with magic 6 with 3 points in mystic and 3 in adept.
he has killing hands and critical strike(4) and mystic armor (2) and attribute boost.

He has taken the mystic spirit, wise warrior(+2 dice with all combat rolls). and specialized in combat spells with a 2 in socery for a total of 9 dice to cast spells.(usually 3-4 hits and spends edge to make it so)
all spells are combat oriented and he has focused his character on dealing stun, ie he dosent want to kill anyone if he dosent have to.

He also has Unarmed comabat (5) specializing in martial arts (7) with an unboosted agility of 5, but usually gets 2 hits with his boost taking him to 7agi.

HOw would you deal with him casting the spell Knock out which requires a touch to cast. He always casts it at 12 + the 3-4 hits = 15-16s. The drain goes to only 3 boxes which he usually only takes 1-0 stun from after the drain due to drain foci and a nice body and logic.

The spell takes a complex action so how can you touch some one in the same turn, so he pays 1 edge (of 6) to act in the 2nd turn. then unloads with a str 5/2 =3 plus crit strike 4 = 7 then rolls 7 unarmed+ 7 boosted att. + 2 from the spirit warrior for a 14 dice pool which he usually gets 5-6 hits for taking his damage to 12-13 stun from the punch being the touch part of the spell than the spell dose another 15-16s. Knocking almost anyone out. Not to mention he has a stelath of 4 with a int of 5. for 9 on a stealth roll. and if he is he suprises for 2 more dice.

How would you call the damage to be absorbed? two rolls one roll either way he is dealing 27-29s. before dodge and body rolls. Now I see the spell as possibly being dodged since it is touch, but the spell is mana based only giving the opponent will to absorb the spell,but how can you dodge the spell when it is touch and he is like martial arts boy rolling 16 dice to hit, so i can say they can dodge to lower the physical hit but they are screwed on the will power only roll due to the spell hitting on mana.

now to reall screw you up the spell is an instant spell, the spell casting is a full action so how can it be instant, does he have to sustain it till he touches some one?

obviously he has found a very powerful and devestating combo Help me?