User blog comment:FairyRaven/Fairy Tail Chapter 368: The Third Seal, Review and Commentary/@comment-82.20.156.238-20140128065458/@comment-7418318-20140128091849

That's a bit one-sided. Don't forget that Zero didn't have a hole scooped out of his side when he fought fought Natsu inside Nirvana.

And there Jellal was trying to survive, since he still needed to give Natsu the Flame of Guilt before he could allow himself to die.

Kyouka only commented about Silver being in his Human form, so I guess Sayla is currently in either her Demon form or a hybrid form (judging from Jackal, they seem to have three forms, Human, Hybrid, Full Demon), though that's just speculation based on what we saw. So far there was no confirmation at all about that.