He was struck by the Azazel that still approached, caught by a long tail and flung down at the ground.  He rolled, and in doing so, he rolled into the same nano-thorn rails that had taken down his brother.  Half of his body was disintegrated in an instant.

It regenerated swiftly as he scrambled away on his three remaining  limbs.  This time, as the flesh swelled out and took form, there was a blur around his right arm, red, more at his shoulder, along his leg.

The Azazel struck out with a tail, and he blocked the blow with the newly grown arm.  The tail sheared off as it made contact with his newly grown defenses.  The chunk of metal rolled into one of the cars further down the road.  Still, Crawler stumbled from the force of the attack.  To avoid being disintegrated, he drew his freshly altered arm back towards the barrier behind him.  Where his blur met the blur that extended from the rail, the two nano-growths merely pressed against one another, almost springy, neither severing the other.

He reached back with his unaffected arms and intentionally disintegrated them.  They regrew, with alterations matching the ones he’d grown on the other side of the body.  Better equipped, he stalked towards the Azazel that had laid down the rails, his back to the one that had struck him from the roof of the bus.

Wildbow, Worm, 26.x