Thunder Drake didn't answer her question. He had stopped talking with her after he made up his mind to stop Arthur. What he had been doing all of this time was preparing to interrupt Arthur's breakthrough.
Like Evergreen said, interrupting Arthur is easy. What is difficult is the consequences of doing something like that.
In order to minimize the repercussions as much as possible, he decided to be as gentle as possible. He needed a spiritual attack that could safely interrupt Arthur without damaging his soul.
It is already a given that the failure to liberate his soul will damage Arthur's spirit. But the spiritual attack to interrupt his breakthrough will also damage his spirit. This is why he was taking so long to prepare.
He took his time to calibrate his attack. Then he opened his mouth and croaked like a frog.
The sound he made was completely silent. This was because the sound was mostly spiritual, not physical.
