In what way does the stranger’s answer increase the tension of the rising action?

After telling the tale of the paw, the Sargeant-Major attempts to destroy it..... even after hearing his story, Mr. White grabs for it.

"I won't." said his friend doggedly. "I threw it on the fire. If you keep it, don't blame me for what happens. Pitch it on the fire like a sensible man."

The other shook his head and examined his possession closely. "How do you do it?" he inquired.

"Hold it up in your right hand, and wish aloud," said the Sargeant-Major, "But I warn you of the consequences."