VincentDarlage said:No, it can't, or it wouldn't have been called a DEFENSIVE blast. How hard is that to grasp? Why does everything have to be defined to an unarguable point anymore? Don't GMs know how to define it for his own game, or was that art lost with the introduction of 3E? It says Defence in the title, therefore it must be used for defence - not offence. It really does not seem that hard of a concept to grasp to me, nor is it particularly vague.
As said earlier I think that Vincent has a great take on this however I think he's being kind of hard here.
The RPG has a "defence value", does that mean that PCs can't use it if they started the fight by charging into a group of Picts? So it's a little fluffy and while I like Vincent's view on this I'd say that it's not obvious.
When the PCs are involved it also opens up a potential player debate that I've seen in the Star Wars RPG where you see people arguing that certain "dark side" powers can be used if the player is on the defence (the whole only for defence, never for attack thing) or if there's "no other choice" (e.g. a last resort). Now if you're a hard ar*ed GM and are willing just to lay down the law over it then that's fine. However with even a slightly open ended game then it can start all sorts of debates with the players.
For NPCs the "defence only" rule for the blast is fine, for PCs it may be a little too grey. The players ride to the temple to save the kidnapped maiden from being sacrificed and the scholar PC ends up in trouble. Can he defensive blast? On the one hand he could be hiding at the back avoiding all the fighting and only ready to counter things that the evil sorcerer may pull. On the other the group are deliberately going into hostile territory and are acting offensively by barging into the evil temple. Complicated.....
Personally I just don't allow PC scholars but if I did I might consider just giving out corruption points for doing a blast. Using Vincent's suggestion I'd veto tactics such as charging into a crowd and exploding. For when it does become a little greyer I'd let the PCs go for the boom but they know that there's a penalty to it. A real incentive for the scholar to stay out of trouble and only go kaboom when he really has to.
I've got to back up Vincent though and say I'd like to see him go through the book and tidy it up somewhat or just produce an official errata. He knows his stuff.....