[@Noxx] about the shockwave, its not affecting you Directly, but rather the disribuition of mana on that place.

Shai is a walking Arcane Node. Think of it as If you were drinking water and someone half way closed the central water registry.
It wouldnt cut out the water completely, but it would take much longer for you to satisfy your thirst. This affected Every Magic user nearby (ir até least Who is using "her" Arcane Node.
Its worth boring that EVERY Magic user has their powers heightened when using her Magic Node. She cant fully control Who access it and Who doesnt, and cutting someone's ability to access the Arcane Network is a lenghty process that can take hours and even days, requiring physical contact, but limito g everyone's access to it isnt something very hard to do.

Its important to think about that as well. Remember that the fact that you are accessing Directly an arcane Node means that its easier for the Arcane energy to reach you, making your Magic stronger. Thats the reason why many Witches want to  apture her and use her and Hunters want her Dead.