It's a very common house rule to allow caster to create 'reactive' evocation blocks (i.e. generating an evocation block instead of trying to dodge with athletics). And even without this houserule, spending your action to create a block is usually not a good idea, they other side can just blast your buddy instead, and you've wasted your action, since your block only has a duration of one turn.
I prefer forcing players to choose between using their magic to attack or defend each round. I think it makes for more interesting choices during a combat. Also, I defend V's decision to put up the block. He doesn't really care if they attack Igor instead (that's what he's there for) and he can always put more energy into the block next round if he needs to keep it up.
Note that you can take backlash on either your physical or mental track. Most spellcasters prefer to take backlash on the phyasical track so that they have the maximum amount of mental stress boxes available for more spellcasting.
Quite true. I'll have to clarify that to the players.
You normally only get a dodge roll either when your dodge roll total is greater that the effect of the evocation block protecting you, or that evocation defense was used to create armor instead of a block.
You don't know if it is higher until you roll it.
Granted, in this case it wasn't likely he was going to beat his shield, but I put it in anyway to illustrate to the players that they get both the defense and the shield against attacks.
As Voldy did not put any extra duration into his block, it would have only lasted until this end of his action this turn anyway.
It would have lasted long enough to be effective against Dave's attack if Barry hadn't collapsed it with his attack.
So Barry didn't have to spend an action to dispel it, it would have dissipated by the time his action rolled around.
Only if V didn't sink more power into it.
Also note that greater duration is one of the advantages offered by 'thaumaturgy at the speed of evocation' available to sponsored magic.
Mental attacks like this are probably a third law violation
It's arguable. He isn't violating his mind, he's just doing a brute force punch to his brain. Given that the alternative is another force attack, it is less likely to kill him (from an in-character perspective).
Leadership tasks like this are normally done with presence, not rapport.
You are correct. I got hung up on the description of Presence as a passive skill, like Alertness, and forgot that trapping.