"We have a weapon kept in a cage - why not use him?"

T:TDW AU.
Frigga has some back up when Malekith tries to take Jane. He doesn’t care about much, but the chance to stab some people…? Yeah, he’s in. And he has some things to say to his ‘Father’ and ‘brother’, neither of whom have deigned to grace him with their presence since tossing him in a cell and throwing away the key.
How will things change with a Loki who is not depowered to make Thor look good, who is part of the initial battle, and who decides that no, actually, he’s not going back to his cell right now thanks?
"He is a liability!”
“We moulded him into a weapon for a thousand years, husband. We may as well make use of those skills when we have need, no?”
… “Has it ever occurred to you that, had I wanted the throne, I would have waited five more seconds before killing Lauffey?”
i.e. Loki is done playing nice. If his so-called family don’t want him, then he’s done playing by their rules. Jane is very confused, and hates this guy so much. Seriously, who does he think he is bad-mouthing Thor and Odin AllFather?! LOKI is the bad guy in this family, obviously!
[extended summary inside]