through reading spell you freeze a spell, by release, if you have a freezed spell, you release that spell (lvl 1 works fine) and freezing spell skill increases your freezing points (dont need at all to can "instant cast" some skill, just let you freeze more skills). So you just need 2 points, 1 for reading spell book, 1 for release, and you should be able to freeze 2xspells and instant cast them(bypasses rehuse delay and cast time, but you will still have after cast delay, so better to be in strings for sg and so).
Edit: You have to cast release against an enemy in order for it to work (its obvious, but just in case)
EDIT-2: Just remembered, release eats your amp, and after that, it casts the skill freezed, so a released skill cant be affected by mystical amplification.
Edited by darktie22, 18 December 2010 - 12:46 PM.