He stiffens at the weight against him, looking down at Leo in alarm, the glow of his eyes (what) fading slightly before he puts an arm around him for support. That glow makes him worry, unsure of whether using whatever powers will wear out his brother or cause something else to change him, but then he feels the pain subsiding in his wing.

Donnie holds him tighter. They need to get back to the Convoy. He is not letting his brother suffer anymore for his sake. The beasts are on the approach again, and Donnie bares his teeth in a snarl as his eyes glow once again, underlining a warning.

His staff catches the first as it makes a lunge, ripped away from his hand as he can't maintain a good grip on it when the creature bites onto it. He pivots to kick it in the side of the face when it tires again, hissing as another rakes its claws into his shell, and he responds in turn, swiping back with his own.

Fly! Flee! Instinct drives him, prodding him to take to the skies, so he beats his wings furiously, gathering his legs as he wraps his other arm around his brother before making a leap into the air.