I'm finding it a little hard to review this due to it's sharing with the-caitiff so I apologize if this comes across as being overly critical.
Firstly Hedwig - no offence but you should have taken note of not being able to kill her off and left it that way - JKR killing her off for no good reason was bad enough, no reason for you to do it as well - also given that you had Hedwig plot (ie the kindred talking etc) in the previous chapter it doesn't make sense to kill her off without a very good plot reason straight away.
Secondly the way Harry behaved and his powers this chapter. I think you've overdone them, especially the whole black jewel-like shield, as Harry hasn't got his jewels yet (not had his birthright ceremony yet) so shouldn't be able to do any black jewel type magic yet.
Thirdly I think you need to consider how powerful you intend to make Harry - in this chapter you have shown him display powers that in the whole history of the dark jewels trilogy only one other person has had - Witch - at the same point in their lives (ignoring that harry hasn't had his birthright ceremony yet). Remember that we only know of 3 other people that have wielded the black even after their of age ceremonies and don't forget what things they have done with that power. Saetan totaly removed a country from existance and Witch effectively and selectively destroyed a whole realm (world) so I think you need to decide what you are planning to have Harry do before you give him such dark Jewels.
Finally, Harry's knowledge - you have his bemoaning the fact that he hasn't got anything to help him learn dark arts in the first chapter then have him casting an aparently dark spell in the second - without any explanation of how he learnt it. Nor did he have a good reason to use it - casting dark magic in the middle of the street is generally considered a bad thing...