User blog comment:Omega natsu2/Chapter 384: Surfing Lucy, Predictions./@comment-3424593-20140509061727/@comment-7418318-20140509082747

We never saw Virgo actually do anything other than bandaging Lucy and changing clothes when she came under her own power.

And not counting the ones he did before being pardoned, the only fights we saw Loke do under his own power were against Mest+Wendy and later against Caprico. The former wasn't showing much, but in the latter it seemed to me as if he was far less powerful under his own powers.

Considering how he wasn't even able to last a whole week without being wreaked by pain during the rebellion against Karen, I doubt a Spirit can do much without the connection to their summoner, with Loke being the only exception due to his past experience in staying in the Human world. But even he is probably bound by certain limits.