User blog comment:GotMilk5101520/How will the Tartarus Arc Part 4 will end?/@comment-5872903-20140709074853/@comment-7418318-20140711083038

In regard to Lucy trying to get up, I'm pretty sure that was just like in the Nirvana arc. If you remember back, there she also went after the Lacrima even though she was completely out of magic, hoping that she would find some way to deal with it.

I'm sure this time was the same. She can't summon any Spirit (Why would she have to get up to do so anyway? She could just as well do that while lying on the ground.), but she was probably thinking that if she grabbed one of the Demons she might give her friends an opening in which they can strike or something similar.