Timothy tried his best to nudge, crack, or even break any tiny portion off of Iron Claw's spine, he tried everything, but it didn't work. It would appear that just like his claws, the dragon’s spine could be considered iron-like as well!
Considering that he just spent thousands of mana points on this attempt, he decided to stop trying. It was a failure of a plan. He was down to twenty-three thousand points of mana now too, and it was best to hold on to them!
“Bastard…” He grunted, and figured that he'd rather not try the rest of his pre-necromantic powers on this beast, because they'd fail as well. He couldn’t do much alone.
Since he couldn’t do much alone, he then decided to return to his group. Even though he believed that their collective attempt to kill the dragon was just as futile as his personal attempt, he still decided to re-join them. He figured that if Iron Claw launched a counter-attack, he could use their bodies as shields. He didn’t want to die today.