Mikoto is being helluva meek. But I suppose that doesn't clash with her established personality. She's more or less only tough when she's solely fighting for herself and is sure of her victory (or that there's no danger present). Like when she's beating random ruffians or trying to beat Touma. Plus she's too good-natured and self-sacrificing anyway to deal with the shady, insidious types.

I think I'd have enjoyed more watching Accelerator have a conversation with Therestina...