Make Stoneskin 2 instant cast

[thunderbreak]

Because investing 24s to cast stoneskins on a raid group before each pull was monotonous. There was no choice or timing involved beyond that initial decision to stoneskin everyone, so you may as well have done it with a macro. That doesn't mean the group version should just ignore the notion of costs - there are still tradeoffs to consider when casting it or not.

And what trade off is that?