I ran out of mana hunting the regular stormies to get the mean one to come out, and had blasted this griffin like 12 times with unaimed crossbow shots. I wound run in, kneel, fire, stand, run out and reload to avoid getting fried. Then I pulsed and got a little mana...

You gesture while calling upon the lesser spirits to aid you with the Spirit Strike spell...
Your spell is ready.
You gesture.
An invisible force guides you.
Cast Roundtime 3 Seconds.
(Forcing stance down to guarded)

>u
[Griffin's Keen, Valley View]
From here a moonlit snow-covered valley can be seen far below. Across the pearl grey field, another peak stands even with this one, almost entirely hiding two other peaks behind it. You also see a grizzled storm griffin that is flying around.
Obvious paths: up, down

>stance def
You are now in a defensive stance.

>cman smas
You focus your mind on the shadows and gird your body for stealth. You find maintaining this mindset to be exceptionally tiring.

>.k608
[Script k608 is running, Esc to cancel, Shift-Esc to pause]
>kneel
>incant 608
You kneel down.
K>
You make a simple motion, quietly invoking the Camouflage spell...
Your spell is ready.
You gesture.
You blend into invisibility among the surroundings.
Cast Roundtime 3 Seconds.
(Forcing stance down to guarded)
KH>stance o
[script done]
You are now in an offensive stance.

A grizzled storm griffin tilts its head, its keen eyes scouring the surroundings.
KH>fire
Wait 1 seconds.
KH>fire
You are no longer hidden.
You fire a black oak heavy crossbow bolt at a grizzled storm griffin!
AS: +524 vs DS: +198 with AvD: +25 + d100 roll: +42 = +393
... and hit for 140 points of damage!
Shot destroys eye and the brain behind it!

[You have completed this portion of your Adventurer's Guild task.]
The storm griffin crashes to the ground, motionless.
The guiding force leaves you.
The heavy crossbow bolt sticks in a grizzled storm griffin's right eye!
Roundtime: 3 sec.

I think if he found me, I would have been toast.