It seems that when using adrenaline on a creature, it gives him a sort of immunity to some shields.
I just thought against an ai that has a procrastination shield.
I used adrenaline on a vamp and let it attack; what followed was that the vamp attacked once, and seemed to get time bubble'd, but then attacked again and got out of it. It did not attack once more after that.
I tried this against an ice shield, and the same thing happend; it got frozen, but all of a sudden attacked again and stopped.
The same thing happend when it was congealed.
This is obviously a hell of an abusive bug, as it can give anyone who uses it an unfair advantage against those spells and shields.