So let me get this straight. D.H. Uses shadow magic and is charging some kind of shadows-related attack, while Maher fires his stunning attack again. Immediately afterwards, Alexander Lyre does this.
Alexander Lyre said
His right hand moved through a series mystical gestures, imbuing the bullet with a simple enchantment. Whatever it hit would be enveloped mystical shadows
All the while, Erasmus is ready to move in and distract the Gargoyle, keeping it away from the real threats.
...
Albeit, the only reason Alexander Lyre is alive right now is because Maher's
friend arrived. Keep that in mind.
EDIT
Also, for clarity: At this point nobody is near the gargoyle. If it wants to dive-attack anyone, it won't be able to get back up in the same post. Erasmus is closest to it, Alexander was knocked partway down the hill side (several feet) but saved by the reinforcements, then there's Thailen and Maher at the tree, Wren is on her way to it, and D.H. is invisible on the hill somewhere. Or at least wreathed in shadows.